I disagree with that. An overstatement of the century.
I made EXCELLENT gains running 60mg tbol for 6 weeks along with 30 mg var the last 4 weeks. I put on 13 pounds and kept all of it and now weigh even more after PCT.
IMO for an all oral cycle, TBOL is the best. No nasty sides and reasonable muscle and strength gains.
GO for it.
Oh and as far as losing its effects after 6 weeks? I didn't notice anything like that. Could've been the additional var though.