I looked at their schematic and to answer your question is NO. They are taking the output from each generator and just connecting them together. They then jumper the two legs of the 50 amp socket together just like if you were to use an adapter to plug into a 30 amp or 20 amp service. Nothing magical here.
The thing to consider is that a normal 50 amp RV service fuses each leg at 50 amps meaning you have a max of 50 amps for each side. Here you have a max of 50 amps TOTAL that is shared on the 2 legs. You wouldn't be able to power as much as you would normally.
It may work depending on what you need to have running at the same time.
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W
solar & many other mods
wife (maybe I should have given her top billing)