I am really suspicious of this claim considering its only source is Eichenwald himself, who apparently made a very similar claim in the past. I'd like to see medical evidence any of this bullshit happened.
I bet he saw the image, got really mad, then made up this bullshit and came in on his own account pretending to be his wife to claim he'd had a seizure.
I don't believe people just see one or two flashes and then instantly go into grand mal seizures biting their fucking tongues off and thrashing around like Linda Blair in The Exorcist. And if they did and had been attacked this way in the past, they'd figure out some way of avoiding it in the future like maybe by blocking images. That is, if they aren't total fucking idiots.
You can bet this moron's Twitter feed is going to be flashing Hypnotoads and shit for the rest of his life after this tale of woe.