How to pass Truth and Reconciliation LASO gravity lift room

Basically, follow this tutorial starting at 12:04:

I tried Halo: Completionist's guide for probably 20 deaths at this part and it didn't work with all the waiting and humping the different walls that I found to be useless in the end, because the enemies will spawn regardless if you just go to that specific spot shown in the video. However, it took me maybe a few more tries after I watched this guide to finally finish it and really it was only because I got bad RNG.

The trick is to just get preferably all the Zealots blown up by Grunts. You want to save as much sniper ammo as possible for the rest of the mission, that is pain in the ass really. Also, to save any ammo, reload the save so that you get a Zealot spawn through the door which you're supposed to be close to when you're waiting for the enemies to spawn.