First off, Two Fish is a big player in the scuba world of Indonesia. They have a solid product. I have been at a number of their resorts, and they do a very good job.
Second... Lembeh is a bunch of different resorts at different price points. No one is putting up with any nonsense there. If a resort sucks, it will not last- end of the story. Two Fish had been around for years. That is good enough for me.
Third, I dove with them in the height of Covid. It was awesome. My guide hadn't been diving in almost nine months. I got photos like the ones below.
Lembeh is a special place. I freaking love it. If you are looking for shiny, happy coral reefs and big stuff like sharks and turtles, then, like Centrals, Lembeh won't be your thing. If you want the opportunity to spend time with your camera, a magical critter, and just you, then Lembeh is perfect.