I've only skimmed the abstract, but it makes me think antibiotics aren't effective. I'm basing that on combining two findings that are explicitly stated there: cranberries don't work, and cranberries are no different to antibiotics. Transitive inference would imply that this means antibiotics don't work, although I'm surprised the authors haven't been more explicit about this, given they've left it ambiguous and it seems like an obvious question

Edit: there's slightly more detail at the bottom where it says "Cranberry products were not significantly different to antibiotics for preventing UTIs in three small studies." It looks like cranberries and antibiotics were only compared in a very limited set of studies, so perhaps take the comparison with a pinch of salt