I just checked - once you destroy all the Revenants and Banshee, around one mega-barnacle, they don't spawn, I spent maybe two hours there, and they didn't spawn. Then you can collect all the materials in peace.
I entered the shelter with SRV, then destroyed the Revenants with L-6 from the entrance, and then changed the suit to Dominator with 2 shotguns and stowed reloading, and entered the Banshee under its belly and jumping in the air destroyed it relatively quickly. Of course low gravity helps in everything.
In the end, I was searching and trying everything to see if I could find something new, entering the opening from which the semi-refined falls out, dropping the spire compound there, then coming with Maverick to see if anything could be cut - climbing on top of the barnacle, then jumping on high balconies under the roof, but I discovered nothing.