Seems to me like intentional misinterpreting to me.
The logical premises of this argument are located at the ends of my arms.
Sums up my thoughts quite nicely.
'they're just bad people to try and get away with that'
There are so many
formations and detachments out there (as I think you've mentioned yourself), why even bother with these little grey areas? Lots of ways to win without spending half your time with the hobby debating GW's wording.