I did the transfer today from the *A lounge to the United Club. It’s still a hike from TBIT to the bus stop, but shockingly the signs are up and clear - but also wrong.
The signs have the bus going to terminal 6 then terminal 8 - but they actually only go to terminal 6.
It took me about 40 minutes total because I had to wait awhile for the transfer bus, it’s not nearly as frequent as the AA regional concourse bus.
The plus side vs walking the tunnel is a street level view of the passing planes. Given this project will finish just in time for the 2034 Winter Olympics, the bus is something I can get used to.