Neat... but also seems like an awful expensive way to run a portable generator while racking up unnecessary hours on a tractor. I paid over $40k for my tractor, and if history is any indicator, I'll sell it as a clean low-hours machine 20 years later for about the same dollar amount I paid... albeit in depreciated dollars. But I could source a stationary power plant for that generator for $2k, in fact maybe even under $1k with enough patience and hunting.
Most weekend warriors are putting ~100 hours per year on their tractors. But running a generator just 4 days per year would double that usage. Needs may vary, we don't get yearly 4-day outages here on our sparse side of suburbia, but I do average at least 50 hours per year on generator. I know from reading this forum that many posters are seeing much more frequent or extended outages.
Not criticizing, though. The guy who came up with that rig may have had a very low-hours need for a very high-horsepower generator, and for that this might be the ideal solution. But that's probably a less common scenario, than those looking to backfeed a house for semi-frequent outages.