How does one bulk-replace all of their Reddit writings with pro-lemmy propaganda ?

Hello, my name is loaExMachina and I'm a redditor.

Jk, I've almost completely stopped browsing reddit, tho so far I hadn't committed to deleting my account, because all I've written was of such high quality that it'd be the worst loss of wisdom since the library of Alexandria burnt down. But now that I saw the deal they cut to train the Google AI on their content, I'm thinking "better erase it than let it fall in the hands of evil."

I recall seing on reddit many comments replaced by something about moving to lemmy and how much better it was, apparently some software had been used to bulk-edit all of the accounts content into this. Is it possible to learn that power ?