No, at least I'm not aware of this type of contest. I have checked the pinned post on telegram but no such contest is listed in the pinned message. If it was, I guess the forum would be flooded within 1 week.
3 types of contest is listed-
1. High quality post
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Out of pure curiosity, are the winning posts mentioned or just the user that has won?
Cause I would love to see what posts have earned this in the past.

Users were mentioned, not the posts. I need to dig a lot to find out but I think some of thehe winning users derserve the post. They didn't spam at least. I have had checked one weel only when I submitted 5 posts for winning the high quality contest. Very few good posters are wearing the stake signature because of the low rate.