Looking at the Reddit thread, the person who posted the pic says he doesn't have any firsthand knowledge, but has heard the changes are moving to a revenue based elite qualification system. Truth is, with earnings already being revenue based (and DL having been the leader there), and with AA and UA having moved to revenue based elite qualification, it's only a matter of time before DL follows.
Unfortunately this further eliminates any sweet spots in the program, but I will say that in practice, what has been good with AA and UA's programs are that short haul flyers who pay an arm and a leg (and often on the worst equipment) no longer get penalized.
I guess these customers may finally get what they've always wanted. Sucks if there will be no more sweet spots going forward.