Data engineering·Governance, privacy and meaning
you removed the id entirely and aggregated to groups of at least fifty, so no row can be traced back to a person even with the other tables.
Anonymisation
Also calledde-identification, irreversible anonymisation
Transforming data so that no individual can be re-identified, including by combining it with anything else. The bar is much higher than dropping the name column: quasi-identifiers like postcode, birth date and employer re-identify people with alarming reliability, so genuine anonymisation usually means aggregation or suppression. Claiming it when you have only pseudonymised is a common and consequential mistake.