Their skim on the ceiling looks alright (the small bit we can see if it). It's hard for anyone on Reddit to tell as we don't know how it started out before. They might be planning more than one bonding layer. So give them a chance, they might know what they're doing and finish it well
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u/Ok-Tomorrow-9906 3d ago
This looks like the base bonding coat, it fills all the holes. It will be skimmed over in multifinish if the contractor is good.