Partly yes, but mostly because people using git are highly biased towards other "new" and "hip" things.

Is this a bug in phy/wlc_phy_cmn.c? Channel 216 doesn't follow the pattern set forth above it -- or is channel 216 really at presumably 50.8GHz instead of 5.08GHz?

I'm seeing the same thing, ALL the time. I've been getting it for a few months with FF2, and I just upgraded to FF3 and it has gotten worse...