I will not reply about a specific group, but I will repeat what I have said before about how I find good groups to follow - whether on Facebook or elsewhere.
First, there a very few absolutes in medicine, or with any condition, so I try to at least consider other opinions.
Second, anyone who deals in absolutes turns me off and sends me running away. If people are blocked for daring to express an opposing opinion or question in a non-confrontational way, OUCH, I can't leave soon enough.
Third, anyone promoting their own cure, method, book,... to the exclusion of all others, is a red flag.
Fourth, absolute rejection of traditional medicine is a second red flag
Finally, any research or studies put forward must meet the tests of being unbiased, statistically sound, and peer reviewed. Here is one example: Last week a study was published showing that by giving Ivermectin to a group of 100,000 people in a specific city in South America, their Covid infection rate dropped by 40% over 6 months. If you looked at the World Data statistics for that country and time frame, the infection rate for the whole country dropped by 40%. So, the data may have been true, but the conclusion was flawed.

Finally, I will occasionally continue to follow outside-the-mainstream groups, just to see what is being said. That doesn't mean I follow their advice.
What is your method for deciding which groups you follow or participate is?
Sue