There are (as yet, he said wishfully) no T-pools on S-class ships.
We have sailed M-and S- class both, and can tell you that while there is as has been said, a Solarium pool, it is not the same as the T-pools. It is not heated, nor does it have the side bars that have the bubbles.
If you are sailing Summit in Aqua, you will have the best of both worlds, as Summit has the T-pool, and now Blu, which is really good.
Celebrity has "Solticized" the M-class ships. Perhaps it is now time to rethink the Solarium pool on the S class to make it a T-pool. As I said before, that would be the best of both worlds.