I wanted to post this as a comment, but it was too long, and I think is the best course of action at this point. So I'll post it as an answer:

I think you bring up a very valid point. But currently there isn't any real tooling that allows what you are looking for. I guess it would depend on the site where most of these comments reside, but on small(er) sites you could try to contact a mod to ask them for some cooperation. You would then just need to flag all comments that contain the content you wish be removed, and flag that as No Longer Needed. The point of contacting the mod(s) is so that they know what is going on here, and why those comments have become problematic. You could help out by deleting any comments you posted yourself in that chain, to minimise the workload.

As you are the account owner your inbox should include at least all instances where you have been @-mentioned. You can access your inbox through https://stackexchange.com/users/current?tab=inbox