Moving to Spurs is not necessarily a slam dunk it was even 6 months ago. No certainty they’ll make the CL this year, Dele Alli trying to get his super agent deal last I heard (so likely angling for a move down the line), plus others like Alderweireld likely going in the summer. Who knows about Pochettino either.
Spurs are on a bit of a knife edge, they might win something and keep their upward trajectory. On the other side I could see a mini-implosion where they lose a bunch of players and have a few (prime Barkley years) in the wilderness.