Personally, I think it would have been ok for Schefter to tweet something like this "A source tells me that JPP had a finger amputated as a result of his fireworks accident"
That way, there's still a bit of "rumor" to it, and it's not blatantly clear that he's sitting there looking at his medical records.
When you take a screenshot of it, and post it for the public to see, that's getting into really sketchy areas, imo. Legally, he might be fine, but morally, not so much.