Re: Morally binding what though?
the fact that the author himself suggests that it's reversible weights quite a lot with me
I give it some fair weight myself. However,
1) He had not said so before this case was brought. I don't think he even had by the time this case had finished, and the judge was considering his verdict.
2) Just because they guy who wrote it thinks it's reversible doesn't mean it is. It would be down to a court to decide. As we probably won't find out unless we have to challenge it, it must be assumed that it's not.
Therefore triggering A50 overrides an Act of Parliament, so can only happen by an Act by our constitution.