Yes, my wireless router has "5G WiFi" but only does 4G. I didn't have a choice about using it since it comes from the provider, but still stupid.
WiFi operates in the 2.4, 5, 6GHz bands, but those frequency bands are not used to differentiate WiFi standards because you can mix and match WiFi 6/7 on all three bands.
There are also more WiFi bands below 2.4 and above 6GHz, but they're not common worldwide.
Tell that to Netgear, AT&T and several other Wifi hub manufacturers.
The default SSIDs on many hubs are names like “NETGEAR23” and NETGEAR23-5G”.