It's like this: Getting people who are severely overweight/obese to the gym is a million times better than them staying at home and continuing their descent into ill health.
It's an unusual step taken by this gym but in fairness, I do see where they are coming from. People who are carrying 100+ extra pounds will often be intimidated by a 'regular' gym atmosphere. This way, they get to meet new people in the same situation. Hopefully, better exercise and nutrition habits can be learned.
Anything that helps people get fitter and healthier while also socialising is worthwhile.
No excuses, just results.
Getting it done one session at a time.