So, I took your word for it that Trump opposes the TikTok ban, and maybe he really does, having possibly changed his mind. But you never mentioned that it was actually Trump, not Biden, who signed an executive order requiring ByteDance to divest itself of TikTok or else the latter would be banned in the US:

https://www.npr.org/2020/08/06/900019185/trump-signs-executive-order-that-will-effectively-ban-use-of-tiktok-in-the-u-s