Archman Im interpreting it that some of the spines we may encounter are treated with hot water, some not. I have All Stings Considered First Aid and Medical Treatment of Hawaiis Marine Injuries and looked for what you ask. Last time I looked them up was for Wildcard LOL. Anyway I dont see a clear answer along the lines sky50960 mentions.
I used hot water for my first Wana puncture with excellent improvement (from severe discomfort) after several hours continued for three days several times a day and was able to remove the bulk of the imbedded spines. The second time the punctures apparently werent as much of a problem as I forgot to when I got home. All Stings Considered says the same thing for wana and Crown of Thorns re: treatment. Heat for treatment for pain is unproven. Some Doctors recommend, some believe it is of no benefit and should not be done.
It does say The skin covering of the top of the sea star, including the spines, secretes mucus that contains a venom with multiple toxins. Wana have pincers that deliver paralyzing toxin on their body surface
. Hawaiis species are incapable of penetrating human skin. And further states People have traditionally believed that wana carry venom on, or in, their spines. Some researchers, however, think the spines are no more toxic than any other foreign protein traumatically introduced into human tissue. It also puts all urchins into one spot and doesnt speak of specific kinds re venom or not. It does say both are self limiting.
Seems odd to me we dont know about wana spine toxin delivery considering how easy it is to pick them up for study. Well, All Stings was published almost 10 years ago. Hopefully sky50960 will clarify.