NAB is worried about it because they use it for production
Yes, that's it exactly. I found this topic interesting enough to do some searching, and found this article that explains some of it. Apparently that band is used by wireless microphones as well as microwave backhaul links. To us not in the industry, WiFi in the home wouldn't appear to impact either of those applications. However, I can see a scenario where someone is trying to do an on-site news report in a suburban neighborhood, and every house is leaking these WiFi signals, rendering the spectrum unusable for licensed users.
https://www.sportsvideo.org/2020/05/12/spectrum-faces-its-next-challenge-as-fcc-allocates-6-ghz-range-for-wi-fi-6/