You could refer to the SegWit2x fork's alteration as increasing the base block size to 2MB.
You could. But I referred to both forks in terms of their maximum block weight:
- Segwit (4MB blocks)
- Segwit2x (8MB blocks)
I only used the expression blocksize so as to keep it simple; my intention was to highlight a confused set of posts, and present a very short & basic correction.