"Nearly" does heavy lifting here.

Because bacteria would need to implement defenses to both attacks simultaneously, the researchers calculated that drug resistance is nearly impossible.

I'm no expert by any means, but I do know that several genetic failsafes have to be overcome simultaneously for you to develop cancer, so I don't see why it would be nearly impossible for bacteria to overcome only two things at once.

So like...is this new breakthrough just taking two different antibiotics for the same disease? Am I missing something?