I have seen quite a few social media posts and been personally told by former students of Sotis and Add Helium that express they now regret taking training from and that they now know how poor the training they got was. I know of 3 of his former students that have passed in the last couple years, I suspect if I actually went looking I could find more. He truly was prolific if nothing else.
I have no idea what the agency he taught for is doing at this stage, plus he also started his own agency as well.
My honest recommendation for anyone that was trained there is they seek out quality training by some of the truly good CCR instructors out there and cover everything. My observations from afar and of some of his former students is they really need to go over deco, gas and bailout management, cell and scrubber duration and dive planning.