To connect it to HA you must use the HomeKit controller, but you don’t need any other HomeKit device or bridge in the house. And you definitely DO NOT need a hub. Reviewers saying you do are just flat out wrong, and you should probably question the quality of their reviews.
As someone else said, you have to use the Aqara app to at least get it on your wifi network. On iOS the Aqara app forces you to add it to the Apple Home App, so you have to remove it from that and reboot the FP2 to get it to be discovered in HA. On Android apparently you just bind it to the Aqara app to get it on your wifi network, then HA will discover it via the HomeKit Controller integration.