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This is bullshit.
A DBMS (database management system) handles all the necessary file file synchronisation necessary for simultaneous reading and writing. It's a layer on top. File access sharing does not matter.
On a file you can write data in-place - without having to change surrounding data. You can clear existing data without the need to free the space it used.
Foreign keys in DBMS prevent relations from breaking.
How viable or costly data deletion or removal is greatly depends on your DBMS/storage system and usage pattern. Do you know how Reddit stores their data?
Data may be marked for deletion and regularly be deleted and indices rebuilt. Or it may keep deleted-marked content but clear its data. Both are viable and effectively data deletion. A record that holds no more of its data is no longer the data it was before.
My role is Lead Developer. So yes.
What's your background?
Just some 20 years of software development. Yeah, if you delete data from DB, you're not a lead, sorry. I wouldn't hire you above junior, mate.