Judging by the specs the router is a dual band WiFi 7 router with 2.4 and 5ghz only, no 6ghz band. Technically a WiFi 7 router but without the 6ghz band. On paper this would suggest it sits below the original Flint 3 in terms of performance however I suppose it could have better wireguard throughput depending what CPU is being used.
My guess is that it will be a cheaper alternative due to the lack of being triband.
I’m aware that the Flint 3 has been on sale for a while and the specs are readily available, there is now a new version in beta testing called the Flint 3e which the specs have not been revealed for.