"Tanking" doesn't necessarily mean 50%. That's a complete strawman.
Strawmen are tanking.
Due to being applied to almost any argument or recitation or logical flair that is used to make a point counter to those preferred by a couple of our colleagues on this forum. The weight and validity of the claim is losing value with each subsequent over-application of the insult. It is quite an improvement, however, because at least they are not calling their rhetorical and expositional counter-forum-posters racist, sexist, istophobic phobe-ist, denying, bitter, clingy, deplorables as often.