THE EINSTEIN FIELD EQUATIONS ARE DIFFERENTIAL RELATIONS. They must be integrated for solutions. Inside the electron’s source layer as pictured by Burinskii, spacetime is FLAT. In such a space, even false vacuum, one may integrate to a potential form, uniquely. Outside the source, not so.
I need to clarify. One integrates the metric solution, but I am speaking of electric vacuum fields and potentials. Since the differential equations are general, we always take advantage of symmetries simplifying solution.