You're thinking about things correctly. The statistical and scientific methodology of clinical trials are by and large the same thing as A/B tests. I don't think anyone is drawing much from this sample of n = 11 except to say it's definitely not a miracle cure. No approval would normally be given to a new treatment for any study of this size.

If an A/B test took a form from almost 0% conversion to almost 100% conversion, you might only need 11 users to show that. But even in that case, the devil is in the details. Were your users really a completely random sample from your population, etc?

The other side of the coin is, can we say these are non-interesting treatments with only 11 subjects? Or are the studies too underpowered to say much of all?