Good morning!
When I look at posts you have authored:
Sparkgapper’s Subscriptions - Apple Community
I see no post titles that seem to fit the iMac topic you describe. Check that link to see of you can recognize that post.
AS your fellow end users, we have no way of knowing why a post was removed by the moderators. Some—not all—reasons for post removal are in Section B of the Use Agreement we all agreed to follow when we signed up here.
Apple Support Community Terms of Use
Naughty words or links to outside "take-apart" sites will get edited out but the post is usually not "zapped" in those cases.
The email contact for the moderation team is in the Terms of Use document. However, they may not remember because of scale. There are an estimated 3 million English-speaking users here worldwide.