President indeed has final say, just read the text of the law. He has the sole discretion to determine whether a "qualified divestiture" has occurred.
The law has an out. It comes down to whether Trump uses it.
Can Trump Save TikTok?
Trump will have to convince companies like Apple and Oracle that he can protect them from the law.www.lawfaremedia.org
TikTok already said they are not selling, so that's not a variable, and the only one who is trying to buy is Kevin O'Leary of all people, who is dangling $20bn, which is a pitiful offer.