If they'd never endorsed anyone, I could see it being a matter of ethics, but just randomly deciding to change an established pattern is lame as hell.
Like, if a journalist publication wants up stay neutral, that's great (preferred, imo). But don't try and backtrack over a decade of partisanship without a damn good reason, and there isn't one in this case. That makes it more bullshit from the owner class, which is business as usual.