The second updated symmetric Gaussian vs. MZ derivatives conjecture

Let a symmetric MZ differentiation be an $n$-th symmetric generalized Riemann differentiation satisfying the symmetric Peano equivalence condition. Two generalized Riemann differentiations are equivalent when they have the same existence relation for the relevant symmetric Peano derivatives. The second updated symmetric Gaussian vs. MZ derivatives conjecture. Each symmetric MZ differentiation is equivalent to a symmetric Gaussian differentiation. The source introduces this as the higher update after the first update and gives no resolution in the supplied passage.