The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/16/bloom.html
Description:
Created the table with exact scripts provided and the index size was;
SELECT pg_size_pretty(pg_relation_size('btreeidx'));
386 MB
SELECT pg_size_pretty(pg_relation_size('bloomidx'));
153 MB
So data used for examples were possibly from a different dataset.