Just a small correction: I think you meant type 214 rather than type 216.
As far as I'm aware, type 216 never progressed beyond the conceptual stage.
While Germany and Italy operate the Type 212A which is more stealthy because of it's non magnetic hull, the type 214 has much longer range, depth and endurance suited for our needs along with being longer. Our Type 214 might also incorporate technologies from the Type 212CG being developed for the Norwegian and German Navies.
That said, I do agree it's worth discussing a mix of additional Scorpènes and German submarines would provide the best balance between fleet numbers, capability, and technology absorption.
The CD, the Dakar, the 218, everything TKMS has sold after the baseline 214 is a derivative of the 216 concept.
Now what is coming in p75i, i cannot say for sure. But what I last remember discussing with Ashwin is that it's not exactly 214 or a derivative of 214.