Class B private address on public network

The Cloudflare post was
Your post was flagged as spam : the community feels it is an advertisement, something that is overly promotional in nature instead of being useful or relevant to the topic as expected.

Why?

I don’t know, but my guess would be that it’s because you reposted the same content several times. It is only one post that’s hidden and your topic is still there and people can reply to it.