1. There is no (to my knowledge) "down" period with regard to lifting. A kid can lift any time he/she wants
2. If they had done it before, then there is no reason it couldn't have been done again. There is no information ANYwhere showing that the type of workout done was "banned" or "illegal"
3. "Questionbable" and "not provable" throw most of your "blog post" (anyone can write a blog these days) and supporting argument out the window. Given what the word "supplement" means, one would think its purpose would be to make one LESS susceptible...
4. "Widely condemned" came AFTER the fact
All that said, the kid can sue whoever he wants. If he wins, good for him on the payday. If he loses, good for him for having the conviction to see it through. My guess, though, is that he is looking for a settlement...