"Quick shot" of my own understanding:
The original Genesis (1988) was an f/5 Petzval refractor utilizing a "long-focus" crown/flint objective (f/10-f/11ish) and a sub-aperture reducer/flattener forward of (but near) the focuser. The reducer/flattener utilized a Fluorite element, but that element neither improved nor degraded the inherent chromatic error of the objective. Tele Vue did tout the f/5 Genesis as an apochromat, but I'm guessing the moniker relates to the "relative" and apparent chroma of the Genesis when compared to a native f/5 crown/flint Fraunhofer.
There was no other version of the f/5 Genesis.
The Genesis SDF succeeded the f/5 Genesis in 1993, and it was an f/5.4 Petzval whose objective incorporated an "SD" crown element. The objective remained inherently "long," and chromatic aberration was reduced to apochromatic levels.
The earlier Renaissance (1984) was an f/5.5 Petzval but did not incorporate Fluorite or any other special-dispersion elements.
Best wishes.
Dan