[yomly]

I don't see any tone in this reply which makes any personal attacks or even any major value judgements on the article itself such as "this is crap not even worth reading" as such I, the reader of both, am informed of an alternative explanation.

The author is then also invited to revise their article if they agree with the feedback.

Perhaps the grandparent could have thanked the author or opened with some positive feedback first, but given the grandparent took the effort to write detailed answers in a noncondescending tone, I see it as a quality informational post. I hope others do too.