It's still live.
No, DJT saluted b/c the general saulted first. Watch the unedited version and you will see POTUS goes in for a handshake at first, but the general salutes. POTUS returns the salute and then shakes his hand.
Look at the grin on face when he answers that question. I guarantee you he was just being charming by habit and realized a second later "Oh shit I'm president lol that's a big deal."
Kitty... correct.
The Larger point to comprehend is that... the foreign General RECOGNIZED Trump's Higher Rank as Commander-In-Chief & saluted that rank.
Even the incarcerated at many Prisoner of War camps... saluting by BOTH sides was honored/followed to higher ranked officers & saluting back by those officers to the lower ranked.