These universal truths I describe are often incredibly narrowly defined, by necessity. I believe very few things are truly absolute, but there are a few.
The fact that you have to define them at all, let alone narrowly, make them non-absolute truths. They are only true under a definition, and thus circular… at best you are creating circular arguments with extra steps to obscure the circular nature of the argument. But its absolutely no different than 1+1=2 being true by definition, you are just using looser linguistic definitions rather thant he mathematical ones.