I don’t think you can still assume that. Just because the infection would be considered minor or be located in an area that doesn’t contribute to pedaling a bike doesn’t mean the rest of your body won’t be affected. Also, as mentioned above, the affect of an antibiotic on your body (and thus performance) can vary depending on the specific antibiotic as well as the dose as they have different side effects and mechanisms of action.
As for recommendations. I would personally stick to Zone 2 for a week but most of all just listen to your body.