Yes, these are all inconsistencies, and are what has me puzzled and a bit worried about your case.
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I have plantar fasciitis. Its manageable and flareups can be controlled. I wouldn't worry about that right now, infection is your main concern. Once you get rid of that and and your skin had healed, then worry about plantar fasciitis. Separate the two in your mind. I treat mine with a special dorsi flexion boot that i sleep in when it flares up. We can talk about that when your infection is gone
The problem with this area is that it takes a lot of impact with each step, which is why the callus is so thick there. Right now, you have what looks like a very tenuous layer of epithelialization over the open area, and this is fragile and quite susceptible to damage with impact or stretch. Eventually, the healing will thicken and contract, and become more tolerant of stress. How long this takes depends on your own rate of healing, but the final stages of it are not complete for six months to a year. This does not mean that you can't walk at all for that long! But the photo you have posted is pretty good proof that the wound is not ready for much stress at this point.
You CAN do some things to reduce the atrophy -- I can't think of any reason why you should be toe-touch weight bearing at this point, or why you couldn't do calf exercises. (Stand on ball of foot with heel just off the floor, raise heel further off floor, then return to starting position -- just don't put the heel down.) Obviously, if you do them and see more of the red in the area, back off for another week or so.
I don't know what you do for work, but if being able to stand on the other foot with the toes of this one down for balance makes it more possible, you should be able to do that.
I would periodically try the dorsiflexion stretching again. One of the biggest problems with this kind of injury is that the Achilles tendon shortens when it is not regularly stretched, and it can be VERY difficult to get all the range of motion back. I had the same issue when I had a major laceration to my right heel. I was on crutches for a month, and then in a cast boot -- my Achilles shortened, and it took months to get it pulled back out to length. (And then I broke my ankle and had surgery on THAT, and never got the motion back )
Immersion causes what is called maceration . . . the new tissue will get soft and may have trouble holding together. I wouldn't dive until you can do some moderate stretching or even weight bearing without seeing the red center come back.
Plantarflexion, or pointing the toes, shouldn't stress the healing area at all, and this is what will minimize the calf atrophy. Dorsiflexion, which is the stretching which is recommended for plantar fasciitis, WILL stress the area, and should be deferred until the new skin is somewhat thicker and tougher.
Skin has two layers to it, the epidermis, which is the top layer and creates the keratin that keeps the skin dry and tough, and the dermis, which is more heavily vascularized, and contains the base structures for hairs and sweat glands (neither of which is present in large numbers on the heel). When skin is destroyed, it regenerates in two ways. Epithelium migrates into the wound from the edges, and also spreads upward out of the hair follicles and sweat glands. If the dermis is destroyed, those structures are gone as well. Two things then happen -- the healing will be slower, because it depends entirely on migration from the sides, and it will be more tenuous, because there is no dermis to anchor the epidermis that is forming. It is not possible for me to tell, from the photographs, whether you had complete destruction of the dermis, but it appears likely; I also don't know exactly what the dimensions of the wound were at maximum (one centimeter is often cited as the maximum area that can reepithelialize from the edges).
If epithelialization fails, the wound will heal by fibrosis and contraction, basically filling in with scar tissue, rather than forming normal skin again. This process is the slowest, but may be your best bet, because it's better than tenuous epithelialization over an area that is high impact.
The care you are getting, and the communication you describe, is not giving me a warm fuzzy feeling.