This is honestly a foolish response, but I'm still not going to flag you. In fact, I'll even upvote your comment so you get a point. I'm sure you aren't writing this nonsense out of malice—you just genuinely don't understand the issue.

Deletion means deletion. There is no such thing as 'we didn't delete it just in case you did it by accident.' That is just a convenient excuse for illegally hoarding user data, and the law strictly forbids it. What is their lawful basis under the GDPR to keep it after I demand deletion? Exactly: none at all.