“Epigenetic switches increase the variability of specific phenotypes” (not genotypes). Check.
So how again can epigenetic switches change genotype? You still cannot provide an answer.
Check again...they admit that classical evolutionary theory with respect to phenotypic adaptation as being brought on by random mutation that is independent of natural selection has been FOUND TO BE IN ERROR.
All your handwaving about this being limited to phenotypic versus genotypic changes is a non-starter because until now, the Darwinists thought that phenotypic adaptation was determined my random (genetic) mutation. As usual, they were wrong!