I would question the gas bottle being there in the first place??
Heatgun at best if you must.
One guy put down a skim coat of feather finish by looks, no floor leveling there. Drying it off? yeah I do that, with heatguns though, the heat is more gentle.
The floor should have been overlayed.
As for being square? if you are installing a tile patterned vinyl, almost certainly never have a grout line close to a wall and you can always centre the vinyl.
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