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BRIN indexes are (mostly) maintained by auto vacuum in a lazy way so they need to recheck. They don't work anything like traditional indexing.
See the link, this was a check where the data is laid out ideally for the index. Manually refreshing the index doesn't affect it
You're over thinking it. BRIN indexes aren't in sync with what's in the table. You can delete all matching rows and the BRIN index will still say "I once saw a min of X and a max of Y in this range of pages". https://gist.github.com/jamatthews/aee20e9184433228bc79e07d3204b271 …
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