Allow me to give you an example of a failure in Molyneux's analysis, on page 22.

If you value truth, it is incumbent upon you to accept the fact
that ice cream contains milk, once it is proven. (If you do not value truth, you would never be in this debate – or any other debate – in the first place!)

First, someone may indeed not value truth and just be trolling for the lulz.
Second and more importantly, what would be Molyneux's argument as to one's duty to adhere to true beliefs once discovered? Does he just assume it? Or does he prove it?