Steve,
unfortunately, I have difficulties understanding your English. Feel free to write me in French, if you prefer. I can answer in French. I do not understand much of what you write in English. You can find my email at www.motionmountain.net .
The statement "The Dirac trick at the Planck scale allows to deduce all of particle physics" is explained and shown in the cited paper, in detail. In fact, the statement is the summary of that paper. I can only encourage you to read the paper. This summary statement also contains *all* assumptions: "Dirac trick at the Planck scale". This is short, complete and clear. Surely it not "too much assumptions", as you write.
The questions about fundamental particle physics for which the answers are not known have been listed by many authors. The full list takes one single page. The questions on that single page ask, among others, about the origin of the gauge groups, of the particle spectrum, of the masses and coupling constants, the nature of dark matter, or of the three spatial dimensions. It just happens that the strand conjecture seems to answer all those questions.
The paper makes many experimental predictions, over a hundred, that follow from the Dirac trick at the Planck scale. Testable predictions are required from any proposed conjecture, in order to check it. Future will show whether the proposed conjecture is right. So far, all predictions agree with experiment. If the predictions are falsified, the conjecture is wrong. Feel free to tell everybody which statement in that paper is in contrast with experiments. That is the reason it was published: in this way people can check the predictions and falsify the conjecture. But in your rants, there is not a single falsification. You just list your personal beliefs.
Feel free to falsify the conjecture: just find an effect beyond the standard model, or find an error in the paper. Many more ways to show that the predictions or ideas are wrong are listed in the paper itself, and on www.motionmountain.net/bet .
The results about general relativity are found in an earlier paper: C. Schiller, A conjecture on deducing general relativity and the standard model with its fundamental constants from rational tangles of strands, Physics of Particles and Nuclei 50 (2019) 259-299, dx.doi.org/10.1134/S1063779619030055.
And I agree with you that many predictions seem incredible and even absurd, given the tiny assumptions.