I am uncertain what chipset, the TP-Link Archer AX6000 V1 router uses. But it's so rare that any manufacture releases code concerning a Wi-Fi 6 router. If I had to guess, I would assume Intel, since it seems they flooded the market with WiFi 6.
Anyway, TP-Links seems more focused than not on v2 and their other routers, so they have released the GPL Code. I'm sure someone who knows a thing or two can use this somehow.
I am sorry you dislike Broadcom, that is your personal opinion and preference and you are welcome to it. But please do not attempt to pass your option as factual to suggest no firmware can be made ever by anyone, as you have stated it has and it can.
Personally, I dislike Netgear routers, for example. That is my preference. I much prefer TP-Link as my brand of choice. Everyone has their own taste, just as you do. There is nothing wrong with having different tastes. But just because I dislike Netgear, does not give me the right to hate on anyone who likes or uses Netgear, for example, any more than you should with someone who by chance happens to be using a Broadcom chip device.
And that is your opinion, which you are welcome to have, just as I am welcome to disagree. There may be some limited capacity with Broadcom concerning features (although that has not been my experience) but not everyone wants or needs every bell or whistle (metaphorically speaking).
I would be happy with basic limited functionality. A Wifi and guest network with WPA3 support and the option to change my DNS over a basic network. But my needs are simple. I can understand and sympathize if your needs are a little more demanding.
In any case. I am curious what WiFi 6 router with 2.5 Gbps or higher ports would you suggest since you seem to have a strong opinion. As you are aware, I am not typically a fan of Netgear (or Linksys), so I would be curious about what alternatives you would consider.
Thankfully, I do not need OpenWrt support anytime soon. I do, however, like to review what is available after my stock firmware is no longer updated. I am not there yet and will not be for some time.
Hopefully, the release of their GPL Code will however assist in furthering along with development in the future. And although you, may not be a fan of Broadcom, please do not discourage others from having a go at it. I doubt you would appreciate it if the roles were in reverse.
Thanks for sharing your opinion concerning what routers you, yourself would consider. It was insightful and I appreciate that you took the time to follow up and give your insight.