Low bar squat is an ego lift that involves less muscle than a high bar squat or front squat. It does not use more glutes and hamstring as some people claim, all it does is use more lower back. When you are completely upright like in a front squat your legs need to support your entire bodyweight. By leaning forward you are putting less of your torso weight on your legs. Your torso only needs to lift the barbell thus you'll be able to squat more weight the more forward lean you have.

Low bar squat is just a goodmorning and squat hybrid. It uses less muscle mass, puts way more strain on the lower back and is more dangerous. And no, just because you use more weight doesen't mean you involve more muscle mass. By that logic a deadlift would build more muscle than a squat. In deadlift you have even more forward lean. A deadlift is almost purely a back exercise and barely ivolve any lower body at all.

You can obviously still build your lower body with this exercise, but it is sub optimal and way more dangerous. Its not the best option. It's actually just a huge troll. No reason whatsoever to do this exercise unless you are a powerlifter or want to feed your ego.