I never implied he used steroids. His claims of muscle gain were never rigorously, independently verified, and were likely invented partially or whole-cloth. He named a researcher at San Jose State University, and said she did hydro-static before/after measurements confirming his results, and she apparently took issue with him using her name and institution for commercial purposes, and also couldn't publicly disclose and confirm his purported results due to the terms of the consent form he signed:
https://news.ycombinator.com/item?id=2100335Ultimately we have no before/after DEXA scan confirming any muscle gain in any timeframe, and just Tim's word and some questionable before/after photos. And even with copious steroids, 34 lbs. of muscle in a month would be insane.