I cannot confirm this. I managed approx. 2200Mbit/s. But the AP is also "only" connected via 2.5Gbit/s. However, the best conditions are also necessary for such speeds. For example, 6GHz with a channel width of 320MHz and then VERY close to the access point and an end device that supports this WiFi standard, has a good antenna and sufficient power to achieve such speeds.

You can try the Ubiquiti app "WifiMan": It gives you tips on what you can improve. However, my U7 Lite and 7 Pro XG also achieve a maximum of 600 MBit/s, but this could also be due to the phone or iPad.