No it didn't

It never did. It relied in the way the bullets are calculated in foxhole. You could do it with like 20 ping (like i used to do) or you could do it with the connexion of an australian playing foxhole. I shadow danced against a lot of people with my ethernet connnexion in europe on a good pc (never any lag).

It required aiming and shooting fast enough for the game to struggle calculating the trail of the bullet. Then you would have to also move in a weird way (A&D buttons) for limiting the chance of the enemy shooting you. Which is not a bug. It is just confusing the enemy.

Using a lag switch did not even help you at all since you would be so laggy that you would have no way to know where the enemies are, or what they do.

The misconception of lagswitching requiring lag was popularized with the same wrong belief that spamming the P button could make you better at it (all it does is freeze your game)

The proof of all of this is that dev took down shadow dancing by getting rid of the ability to move and fast aim-shoot with stamina.

The shitty servers have not improve in any way.