I removed that comment. Why? The short version is that I did not believe it contributed usefully.
First, let me share some background on the Stack Exchange philosophy on comments (apologies if I am describing things you are already aware of). Comments are transient and can be deleted at any time without warning. Comments are generally intended for, e.g., requests for clarification, suggestions to improve the post, or a post-it note for useful information that may be relevant. They are not intended for general discussion. See How do comments work? and A guide to moderating comments and https://cs.stackexchange.com/help/privileges/comment and https://cs.stackexchange.com/help/flagging for more authoritative resources on the Stack Exchange guidelines regarding comments.
On to the specific comment I deleted. Your comment had two parts. The first part, to my eye, appeared to be basically redundant, to the extent that I could understand it. I did not see the purpose in retaining that part. The second part disclosed that you would be flagging another comment for deletion. I'm a bit wary about the potential for an extended debate about whether some other comment should be deleted, in the comment thread under that question. So, I tried to head that off preemptively. I don't see any benefit in retaining the statement that you have flagged the comment, and there is a potential harm in keeping that part of the comment (there is a potential for it to lead to an unconstructive debate on that comment thread about whether that other comment should be deleted). If you see a comment that should be deleted, flag it, but don't leave a comment saying that you have flagged it.
For those reasons, I deleted it. I'm always open to hearing a contrary perspective from the community, but absent that, I don't plan to restore it. I can't speak for anyone else on the moderation team.