Languages and genres may be different but there are still common principles by which they operate. There are also common principles by which methodologies in general operate, and one of those principles is that if you want to establish that your methodology works, you need to test it against something of known provenance. It’s called “having a control.”
Try Tolkien. The Hobbit, The Lord of the Rings and The Silmarillion. They are not only the same genre by the same author, but they are about the same fantasy world. But as @Daniel_Fisher pointed out in the thread to which I linked:
I appreciate the other points that you’ve been making. There are other lines of evidence that we can and should take into account. But my whole point is that literary criticism of any form is not an exact science like physics, chemistry, geology or test-driven software development. It is a humanities subject, and as such it concerns the vagaries of humans and other living beings. This being the case, things aren’t going to be quite as black-and-white as when you type computer code into Visual Studio and then run a suite of tests to make sure that it does what you expect it to do. It will be a lot harder to establish just how reliable your conclusions are for starters.
Or to put it another way. For each of the epistles in the New Testament that are ascribed to Paul that are disputed by scholars, what confidence level can you assign to the thesis that Paul had nothing whatsoever to do with them? And how, precisely, can you calculate that confidence level?