.related-wrap #related_tag_posts exists in the source, so these are posts belonging to same tag, also, most of them are latest articles, so I guess they should be removed according to the updated checklist:
> Dynamic lists of "Latest articles from this category”, “More articles by this author”, “Featured articles”, etc.
Since when new articles come out, this 'Gerelateerde artikelen' section would be updated, i.e. it's dynamic.
You correctly noticed, the block contains a class "related_tag_posts" and this is enough even if they are relatively static
Type of issue
Rudimentary content not removed
Reported
Mar 28, 2019
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> Dynamic lists of "Latest articles from this category”, “More articles by this author”, “Featured articles”, etc.
Since when new articles come out, this 'Gerelateerde artikelen' section would be updated, i.e. it's dynamic.