Let's backtrack a little: EXACTLY which wifi protocols are you using? Which ones does the router support and which ones do your devices support?
From your picture your router supports 802.11ax, but do your devices?
iphone 12 should support 1200Mbps via ax (80Mhz channels, 2 spatial streams)
Wi-Fi specifications for Apple devices
Learn about Wi-Fi specifications for Apple devices.
support.apple.com
Pixel 6 should also be similar, as it supports AX and 6E via 2x2 Mimo
Pixel phone hardware tech specs - Pixel Phone Help
Take a look at the tech specs for Pixel phones. If you're interested in buying a Pixel phone, visit the Google Store. P
support.google.com