It supports a whole new architecture (Ampere) and all the good stuff that comes with it: Multi-Instance GPU partitioning, new number formats (Tfloat32, sparse INT8), 3rd gen of Tensor Cores, and asynchronous copy/asynchronous barriers. These are huge features.

Well, I think a new microarchitecture means a major bump. So between that and version bumps to to actual major software features, you get to 11 within 13 years or so.

Also, GCC 9.x compatibility may seem minor to some, but is significant for others. I also think there's some C++17 support in kernels - that's something too.

Usually for an API it indicates a breaking change. In this case the removal of some functions which might require refactoring on the consumers end.

I think the page lists the changes since 11.0 RC, not the previous major version.