Earlier quoted context omitted.
Wont a good trainer dig it out, to some extent? As an aside, exrx is my go to site for no frills "non-bro-science" advice. They back it with simple old-fashioned gifs for each exercise.
Yet their gif of a stiff-legged deadlift has the lifter bending his back. Most fitness trainers went through a crappy class/college program and know less about fitness than the average fitness bro, let alone anything about muscle imbalances. At least, in my experience from paying a couple.
Can't really blame him, it must be hard enough already to keep his balance in those running shoes.