It is a different device. I hope I don't break any rules by giving external link https://www.aroged.com/2023/05/29/review-and-testing-of-asus-tuf-gaming-ax6000-wireless-router/
The old GT-AX6000 is clearly broadcom though OpenWrt on ASUS GT-AX6000 but GT-AX6000 and TUF-AX6000 are different devices.
The link to FCCID https://fccid.io/MSQ-RTAX6700 There are internal photos, which clearly show that it is MEDIATEK.