My point is that adding a disclaimer about your employer only matters if the post has a possibility of being seen as astroturfing if the reader doesn't know about the relationship between the poster and the company.

For example, if jgrahamc said "I never knew that. Cloudflare is such an amazing company, everyone should apply for a job there!", then okay, request a disclaimer. But if someone just says "I didn't know that", then the comment goes from mildly interesting (if you know who they are) to boring (if you don't know who they are). The failure mode here for lack of disclaimer is the post just becomes a boring, low-effort comment.

I think jgrahamc adding "I'm the CTO of cloudflare, and I didn't know that!" might have been reasonable context, but no disclaimer is required, because the reader didn't need to be protected from the post. There was no conflict of interest in the post.