I disagree with your comment about the Linksys MR7500 router. I also own one, and for the 6 GHz band to function, your PC or phone must be compatible with it. If it's not, it's perfectly normal that it won't appear in the list of available Wi-Fi networks.
do you have 6Ghz adapter on your Computer? btw Linksys routers reliability has fallen in past 6-7 years last 7 years 2 of my Linksys gigabit router has failed.
I guess you didn't watch the video. He has tells you he has the same problem on his quest (which is wifi 6). Also he shows you his old wifi 6 router on the floor which works fine. However you are correct you do need the right equipment, which he seems to have.
Dam! Bro hit his limit with the routers. If it makes you feel any better, I got a Nighthawk RAXE300 and the 6G band doesn't show up either. That being said, I don't have any 6G capable devices so guessing this is why it is not showing up.
It's because Client Steering / Band Steering / Smart Connect is enabled. For whatever reason, most modern WiFi 6E or 7 routers have this feature enabled by default. It combines all 3 bands into one network. Connecting your device to the best available band automatically based on compatibility and network conditions. I always disable it, because it's so inconsistent. It always connects my devices like my computer and phone to 2.4ghz instead of 5ghz and 6ghz.
I have the same router. The router works perfectly fine. He just needs to disable a feature called "Client Steering." So the rest of the bands show up as individual networks. Most WiFi 6E or 7 routers from many brands have that enabled by default. It goes by different names (Client Steering, Band Steering, or Smart Connect). Keep that in mind, in case you need to disable it on future purchases.