I'm not so sure as it says "This course will not qualify you to accept, document or package dangerous goods".
You won't be doing any of those things. Someone else will formally accept the DG and ensure it's documented and packaged properly, you merely carry it on your aircraft. There are a few key things you need to know, but they don't involve determining whether the DG is actually able to fly or not (that's the acceptance role). The online course you're looking at is fine, and is all that's required.