Trump supposedly said he will save tiktok, but wasn't he wanting it banned in the first place?

I do not get what his logic is here. He doesn't have to earn votes anymore so why bother acting like a hero?

By the time this post shows up for anyone, tiktok will probably be back anyways...

Also, given the short attention spans of tiktok addicts, will they even remember it's existence in a day or two if it does not return?