A square triangle and a group that is sweet on its own

Hi. Asking a question later in the book Moves Among the Standing and later in your podcast with Doshi.
In the book Walks Among the Standing, you talk about how, from a philosophical point of view, there is no validity to a thing in its own right (the validity of the Torah comes from God/the status of Mount Sinai, the validity of the universe comes from God, etc. The High Court of Justice receives its validity from the laws of the Knesset and the Knesset from the validity of the people who elect the representatives). At the same time, in the latest podcast with Daniel Doshi, you explain that God is omnipotent, but cannot create something that cannot exist/cannot exist (an object so large that it cannot move/a square triangle). These two lead to a deadlock, if God, defined as the first group/a group that is not defined/has validity because of something else, does not lead to a philosophical contradiction. In other words, just as God cannot create a square triangle, which by definition does not have such a thing, how can God be a group/a thing that has validity in itself (also something that you claimed does not exist).
 
thanks!