Intention and flavor sound like a pretty solid foundation to me even if the end result isn’t mechanically B/X. That’s fine if not a good idea. I did note it wasn’t a retroclone after all.I saw that she said that, but the end product -- to me, at least -- reads more like B/X in intention and flavor, but not so much in mechanics.
There's a unified XP system, it uses advantage/disadvantage, race and class are separated, there's a unified resolution system, ascending armor class, etc.
I guess she just built up from B/X, making the choices to use modern mechanics throughout, and just ended up at something that resembles a stripped-down 5E without that necessarily being the intention.
In any case, I think it's immensely easy for a 5E DM to run, as most of their existing assumptions hold true.