"there is not a way to restrict help articles from coming into the feed"
During migration from the "old" platform, you put new date-time stamps on the topics, which seems to be how the coding works for the content listing "Feed." Are you sure you cannot backdate them?
The migrated posts were moved in mass from the old community to the current one in December of 2019. The platform we're on now doesn't support backdating, all of the posts from that migration have a posted date between 12/6-12/19, like this one.
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