Boring, boring, boring
"There's a possibility that such antimicrobials engender resistance - but resistance to antimicrobials used in that manner, NOT to antibiotics, which are, quite simply, NOT used in that manner."
But all antibiotics are antimicrobials

THIS IS VERY HARD WORK! none so blind as those that cannot see.
Antibiotics Versus Antimicrobials

An ANTIBIOTIC is a low molecular substance produced by a microorganism that at a low concentration inhibits or kills other microorganisms.

An ANTIMICROBIAL is any substance of natural, semisynthetic or synthetic origin that kills or inhibits the growth of microorganisms but causes little or no damage to the host.i.e.
The term “antimicrobials” include all agents that act against all types of microorganisms – bacteria (antibacterial), viruses (antiviral), fungi (antifungal) and protozoa (antiprotozoal).