This isn't really a question or a request for support, just some info that I found helpful: the fact that this page is uncacheable for authenticated users can be confusing for folks who have seen a block's cacheability settings include a "user" context, but have the page still cacheable by DPC (internal dynamic page cache module).
It took me awhile (and several conversations with folks much smarter than me) to realize that blocks are _different_. By default, all blocks are set to be lazy built, which is why setting a "user" context on a block doesn't render the entire page uncacheable by the DPC.
-mike
Needs review
1.1
Documentation