I didn't make a study of it (surprised if I hear that you did) but the point is, the place has far more good reviews than bad, or they wouldn't average 4 1/2 stars with only a handful of Dec. reviews ~ Mahomes bro issue.
When I sorted them by "most recent", the first bad review is "bad service" this fall, while restaurants/bars are struggling to find servers in MO.
The next bad review is January of 2021 and complains that the restaurant refused to serve a group of girls who walked in at 10 pm, and closed when the posted hours on the web page were midnight. This was during a Covid surge in KC and I believe bars were mandated to close at 10 pm.
So I don't know how you conclude that "none are related to Covid staffing issues". Sounds to me like confirmation bias at best
All restaurants I'm familiar with have 1 star and 2 star yelp reviews, including restaurants where I've always had great service.