It is a law passed by congress. The only way to reverse it is to (a) have a court invalidate the law (already tried) or (b) have congress reverse the law. Trump can say something about its enforcement, but he can't actually reverse the law (at least according to the constitution, which he also said he wanted to interpret differently).
Sure, when I use ${Chinese_App}, I expect a Chinese bias to the algorithm. Same with every other aggregation service or media provider. Same way I expect a US bias to moderation here or on other US sites.
Of course he will reverse it, but just as obviously he was the one who asked ByteDance to block it today...
Biden said (a day or two ago) he will leave enforcement of the ban up to Trump, and ByteDance have been fighting against the ban since it was ever suggested ... so why do you think ByteDance are now voluntarily shutting down access today?!!
It's really no mystery - Trump has already been talking to ByteDance and agreed to let them continue operations in return for favors to himself which have yet to be discovered. As part of this deal, Trump requested ByteDance to shut it down today, so that he can be the hero and have it reenabled tomorrow or soon after (according to how he wants the optics to play out - pretending to take some time to "make a deal", or an immediate "day 1 - look at how great trump is").
You people are being manipulated like sheep. Calm down, it'll be back very soon.