At his age, removal would not be recommended - it carries big risks in longterm, he could end up similar to Umtiti
Similar yet different to Umititi.
The damage if getting the call wrong here right now could be like Umtiti but I think it is a much different situation that Ansu is facing. When you compare the two and from my understanding of how things played out, when Umtiti got injured, he elected not to have surgery as recommended and went with a longer rehab process so he could be fit in time for the World Cup. And this lack of correction from the initial injury which a surgery could have prevented was a big factor in why Umtiti kept relapsing and his knee degenerated.
That pressure to beat the clock and play in the World Cup was a huge factor for Big Sam, as well as the fact that he was much older than Ansu is. Especially since Ansu is so young, his body can heal and recover stronger from something more intensive like a surgery than Big Sam could at that time of his career. So it is important to keep this in mind and not "catastrophize" the situation.
I am not a medical expert by any means so I am not going to pretend like I know what I am talking about when it comes to what decision needs to be made in terms of removing/keeping his meniscus, especially with limited half-truth that comes out on social media. I just want him back healthy and fully confident again, not 80% fit with him not trusting his body because that will hurt his development.
Its just sad that the injury came when it did, maybe if weren't in such a spiral when that happened, he wouldn't be in this situation.