Even if I "hide" the 5ghz, and "forget" the SSID on my android phone

NEVER MIND.   I just tried this on Orbi RBR50 with Samsung Galaxy S24.  Verified that Broadcast SSID was working correctly using WiFi Info View (free for Windows from Nirsoft).  "Forgot" Orbi SSID.  Powered off phone and restarted it.  Selected SSID from those showing, and the phone connected at 5G.

What worked perfectly on the RBR50 several years ago no longer works.  Maybe the Orbi now has some "band steering" feature?  Maybe the Samsung phone tries 5G even though there is no SSID being broadcast on 5G.  Maybe the Samsung phone 'remembers' SSIDs even when told to forget them?   Annoying.  (Sort of academic because Netgear removed the SSID broadcast option when Orbi WiFi6 systems were introduced.)