Eligibility of a file for vacuum is based on the date that the file was ,asked for deletion and not on the creation timestamp of the file.
Delta table data files are deleted according to the time they have been logically removed from Delta’s transaction log plus retention hours, not their modification timestamps on the storage system.

Can you please confirm that the files were marked for removal before the retention period to make sure that they are eligible.

Thanks, I know that, but the table history shows 30 days, but the actual data size and number of files and all other indicators , correlate to 170 days.