A person claimed they already found a vulnerability, maybe reported it or just ignored it, and this was the same vulnerability. That person provided no evidence this was true. My impression was that people were downvoting it because they thought it was a lie (no evidence) or thought an unsupported "me too" claim added nothing to the discussion. You (a) didn't spot that or (b) asked about votes [1]. Both can lead to further downvotes. I just skipped past this whole, pointless section of the comments as I imagine most people do. Some people will downvote stuff like this, though, to clean up the thread or out of irritation.

[1] "Please resist commenting about being downvoted. It never does any good, and it makes boring reading."