No, I would not care to demonstrate. A proof that a solution exists is not the same thing as a procedure for obtaining a solution. And this isn't even a formal proof: it's a rough sketch of how you'd go about constructing one, informally posted in a blog's comment section as part of a pointless and unpleasant discussion of religion.

If you can't follow how "It is possible-in-principle to calculate a Solomonoff prior for this hypothesis" relates to "We are dismissive of this hypothesis because it has high complexity and little evidence supporting it." I honestly can't help. This is all very technical and I don't know what you already know, so I have no idea what explanation would be helpful to close that inferential distance. And the comments section of a blog really isn't the best format. And I'm certainly not the best person to teach about this topic.