it's very true
It's true: she ran an AR, but in a race where the conditions were so perfect and the course so easy, a semi-pro basically masters runner set the AR for the marathon. If any of the top tier runners had been in this race, Hall might have finished 5th, and the marathon AR is going to start getting further and further way now.
This AR is like the Raptors' NBA championship - it took a lot of other people not participating for it to happen.