The post title is "How to pacletize a resource function" - but you seem already to know about the function PacletizeResourceFunction, so it's more of a "Why can't I pacletize this one resource function" post.

The answer to that would in general need to come from the author of the resource function in question.

In this particular case, the function is already pacletized and you don't need to bother with the resource function. All you have to do is load the GeneralUtilities paclet, which is already installed in your system:

<< GeneralUtilities`

PrettyForm[Table[x^i + j, {i, 3}, {j, i}]]