I have no clue if this miracle is real or not, but even if it is, I don't see how it proves much about the NO besides its basic validity.
1: I don't think the Devil would do this, because, as Sean says, this type of miracle would increase, not decrease, faith in transubstantiation, even if the NO rite itself discourages such faith.
2: I grant that God could do this in the instance of an outright invalid priest (as the Sedevacantists would believe is the case) but it seems unlikely that he would because it would be a form of tricking people, he'd be tricking people into believing the Novus Ordo Eucharist is the true body and blood of Christ when it really is not.
3: I do believe, anywhere on the spectrum of trad opinion that says the NO is still valid, anywhere from the softer "the NO has problems and is imprudent" to the stricter positions of "you should never go to the NO, but some people can still receive graces from it" (As Bishop Williamson I believe has said), I can make sense of this being a valid miracle. As Sean pointed out, this type of miracle could be God's merciful means of confirming to the faithful the miracle of transubstantiation even if the rite is bad and ought never to be attended by those "in the know."
4: I wonder if the crying madonnas could mean something else, and could perhaps not have been faked. Not that they'd mean EO is the true Church of Christ, of course, but perhaps Our Mother is mourning the schism? A Catholic friend pointed out to me a couple years ago that EOs seem to have a disproportionate number of crying madonnas. I could easily imagine such a thing being real, and pointing away from the EO.