Well, I called the ATO - she concluded that my acupuncture treatments from the acupuncturist who is registered are claimable but the ones from the one who is not are not.

Also, the ATO confirmed what Manhattan said, that because DH is my spouse, I can add his out of pocket medical expenses to mine and claim them all on behalf of both of us.

I also got a receipt number and she took my tax file number so I assume that even if down the road there is an issue, there is a record that I queried the ATO and was following their advice.