If Frydek is a hybrid, I've never read or heard anything about the parentage or the breeder. With a plant like that, ypu'd think the breeder would like to get credit for producing it. Besides that, I have a hybrid of Frydek and bullata - the original cross was done by Brian Williams years ago. I used that hybrid to produce a cross involving my Imperial Giant as one parent and the "Frydek-bullata" as the other parent. The look of the seedlings indicated to me that Frydek is not likely to be a hybrid of A. micholitziana as I did not see hybrid segregation indicating a throwback to the putative pure A. micholitziana or indications of the identity of another unknown parent. So this is my view - Frydek is a sport or cultivar of A. micholitziana, not a hybrid. IMHO, to make a hybrid that looks like Frydek would take years of work - such extensive work could not be kept hidden from plant fanciers/inquisitive members of the IAS as some of the "culls" from the cross would be valuable in their own right as collectors items!
LariAnn