If it is not phonemic, what is it? It is not necessarily "regular" or "uniform" in the phonemes that are represented, but you can't consider it anything other than phonetic, as the characters represent phonemes. Pretty much period.
As said in other threads, you are not wrong that there are more direct 1:1 scripts to phonemes. You are wrong to think that is what phonetic means.
As said in other threads, you are not wrong that there are more direct 1:1 scripts to phonemes. You are wrong to think that is what phonetic means.