My guess is that any highly concentrated sugar solution will kill bacteria.
Finally a voice of reason!
A high sugar environment will not allow bacteria to grow. This is why fruit preserves have quite a bit of sugar in them and why one should not try to adjust the amount of sugar in the recipes.
Bacteria may not grown in a dish full of honey, but eating the honey will dilute the sugar concentration though the human body and render it ineffective.
I would give more weight to its use as a topical treatment than a systemic treatment.