This is not so much a case of "Einstein Strikes Back" as it's a case of the croupier (the Universe) dealing another favourable card for one of the players at the poker table (Einstein). Who knows what hand those neutrinos are holding
I'm actually somewhat underwhelmed by this.....really, it's just a case of someone having applied and measured GR on a cosmological scale that hadn't been attempted before, mainly because many labs never had equipment sensitive enough to do the work. Given their confidence in GR, this result ought to have been expected and not come as some sort of a surprise. It's more of a reaffirmation than a revolutionary result in favour of GR. An incremental step of confirmation in a particular situation. I would consider the unequivocal detection of gravity waves as a revolutionary result for GR...not this.