hey mate as I can only use vanilla assets when i build i have no way to stop loot spawning in these buildings at all, so to the best of my knowledge theres no way to stop this.

This instruction is only to remove certain spots from loot spawn:
Go to your missions folder on your server and find the item "mapgrouppos.xml".
In game go to the spot where loot spawns and check your coordinates. When using VPPadmin tools, just look at the building where loot spawns that you want to remove and press P. That will copy the coordinates of that building in your clipboard.

Look for those coordinates in your mapgrouppos.xml and remove that line from the file.
Now that building wont spawn loot anymore.

could u not just go to this and make a chang for exs like in your mapgroupproto look for the name Land_Village_Pub copy it and make 2 of them now 1 of then dellet all the point's and the category and tag all to have it not spown in loot at all now rename the new Land_Village_Pub like this Land_Village_Pub_new... now in the mapgrouppos look for the Land_Village_Pub from the mod and chang the name to the new name Land_Village_Pub_new now it will spown the building with no loot ..

Could you share your files?

gunner go to the build copy it then go to mapprotospos and find it then change the pos so its in proper spots that you want i guess is the only way