I routinely set garden variety FL dies to produce two or three thousandths shoulder setback. While this doesn't size the case as much as the die may be capable of doing, it does size the entirety of the case and so is full length sizing. It's just not full length sizing more than necessary.
It appears you've wound yourself up into a state of righteous indignation or the like over terminology.
I don't think it's that FL sizing is more accurate than Neck sizing, but rather that FL sizing isn't less accurate than Neck sizing and is generally more reliable for their type of shooting.
Some of these champions were also bench rest shooters. Still advocating "full length resizing". As I suspected, they are probably NOT advocating it as the term is commonly understood.
https://www.youtube.com/watch?v=vaqg4sJvg24
