My impressions here:
Inter really want Ndombele and are willing to jettison Skriniar to get him, but also feel they have Spurs over a barrel and want to press for a good deal.
Ndombele wants to go to Inter.
Mourinho likes Skriniar and is willing to lose Ndombele to get him. That PEH looks to be getting finalized likely means either Mou didn't like Brozovic or Brozovic didn't like Spurs.
Levy is extremely hesitant to swallow a loss on Ndombele after one year.
There isn't really any indication that Skriniar is super eager to leave Inter for Spurs.
All told, a LOT would have to fall into place to make this deal. If it were up to Mou, Conte and Ndombele, it would just be a straight swap and everyone would be on their merry way. But there are three other parties with different ideas.