Consider instead editing all of your comments so that they link to one of the threads about the blackouts and say that you moved over to Lemmy, with a link to a Lemmy instance and something explaining the Fediverse.
You can use Power Delete Suite to mass edit your comments. I personally used the pkolyvas fork which adds a 5 secs timer to comply with new API rates (but then it's very long so you have to keep it running for a few hours).
For example this is how most of my comments now look like:
(don't copy the same text otherwise you're just helping Reddit justify undoing the edits by considering them spam)
Seemy like Reddit is already restoring overwritten comments!
You need to use a fork which adds delay. My comments haven't been restored so far and it seems to be working.
Ok i got a fork, do i also need a spoon?
thx!
Which is why I use a script at least once a day to edit all of mine.