From: Steve Shaw
Date: 27 Feb 18 - 09:10 AM
Whatever. Whoever wrote it was seriously misinformed. Treating food with antimicrobials during processing has no impact on antibiotic resistance whatsoever. Nowt to do with it. Antibiotics are used on living animals, not dead bodies, so antibiotic resistance don't come into it.

The above from our "well-educated scientist/biologist".

But it is not the animals/meat which are the target of antibiotics it is the microbials (bacteria etc.) The fact that the host animal is dead doesn't prevent any microbials present from building resistance to the antibiotics used. (assuming they are not all successfully killed)