The good news is that there is a redacted area in the image, so Trump probably didn't just snap and post ... evidence of some limit to the impulsiveness of the commander in chief.
The interesting thing about the black box is that it is square to the frame of the image and slightly skew to the text boxes in the original intelligence product. This indicates the image posted is not simply a camera phone snap posted directly to Twitter, the image was edited before it was posted
> there are certain cases where it may be in the public’s interest to have access to certain Tweets, even if they would otherwise be in violation of our rules. On the rare occasions when this happens, we'll place a notice – a screen you have to click or tap through before you see the Tweet – to provide additional context and clarity. We’ll also take steps to make sure the Tweet is not algorithmically elevated on our service
We will only consider applying this notice on Tweets from accounts that meet the following criteria. The account must:
- Be or represent a government/elected official, be running for public office, or be considered for a government position (i.e., next in line, awaiting confirmation, named successor to an appointed position);
Not just Top Secret. It would also be classified as TK (Talent Keyhole).
The classification system is compartmentalized to limit exposure of things -- like raw intelligence & intelligence gathering capabilities -- to those who really need to know.
I agree that Trump "probably didn't just snap and post". His Twitter account has always been shared between Trump personally and his staff. Frankly, calmly sharing facts and evidence like this is 180° from the pattern of Trump's more impulsive tweets.
Edit: Furthermore, Trump's personal phone is an Android, and this particular tweet was from iPhone.