You completely missed the point. 400% is meaningless without more context. If I increase my odds of winning the lottery by 400%, I’d still be a moron for wasting my money in the lottery. Percentages are constantly abused in marketing and news articles to imply things that don’t really apply.
So yes, the article doesn’t actually specify how much your risk increases due to being exposed to those chemicals, just saying 400% is about as informative as saying 6 or 10,000. It implies a significant risk, but doesn’t support it. Without knowing how much risk there actually is it’s impossible to evaluate if the benefits outweigh the risks.
Calling him a religious weirdo gives too much credit to the cult/scam that scientology is. At best he’s a brainwashed cult member. I feel like 200 years from now people will be studying the rise and fall of scientology as it’s a fascinating case study of what happens when a scammer sets out to create a cult and actually succeeds. The fact he got away with it despite evidence that it was always intended as a scam is even more mind blowing.