How to confirm the pg_hba.conf service is correctly working

Hello all

A while ago, our company had an Postgres DB that was Hacked login db to
modify data
found that pg_hba.conf is not work
Any ip, user can log in to DB

1. The rules in pg_hba.conf are almost invalid
2. pg_hba.conf is only useful for METHOD = trust
3. check SHOW hba_file; the file location is correct
4. select * from pg_hba_file_rules; checked is correct
5.DB version : PostgreSQL 10.19 on x86_64-pc-linux-gnu, compiled by gcc
(GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit

Even if you delete the text in pg_hba.conf
Keep only

host VJ VJ_USER 10.10.10.1/32 md5

After pg_ctl reload and Restart DB , any ip, user still can log in to DB

Please help how to check whether the pg_hba.conf service is defective
If you need any information, I will provide it

Thanks