Tbh, I don't think Pochettino wants to return at all, certainly not right now.
I think he is absolutely dead set on getting his big move at Real Madrid and considering Ancelotti will be there until 2024, Poch probably thinks that his chance. What if he comes back to Spurs and is a flop, like so many returnees are? Why would Madrid want him then? That's basically his managerial career in tatters when it comes to any top club wanting him again.
We'd either have got him in already or made it clear that he's returning in the summer and not touted around as been having thinking of other managers. The uncertainty when it comes to Poch and Spurs isn't a good look on either the club or him.