Have seen several iterations of the triangle hitch systems by several manufacturers. (See Jiffy Hitch for a modern version https://www.jiffyhitchsystems.com/). Have seen some home made as they’re pretty straightforward to fabricate for those with moderate skill and tools.
Some allow (or require) welding the female plate to the implement. Most pin on and can be pretty easily removed by removing the bolts (as jimh406 already said). The bolt for the toplink is visible. Without a side view or back view, can’t see for sure if it’s just bolted to the pin mounts on the bottom or not. Probably is but can’t say for sure.
It looks pretty sweet except the extremely short PTO shaft between the tractor and hitch appears to create extreme angles at the U joints when raised. Looked to me like you’d have to be careful to shut off the PTO before raising the implement to avoid a spray of shrapnel. Could be wrong. Otherwise, it looks like a great system.
I actually considered it when I bought the Kubota but I’m too cheap to convert all the implements. So far I don’t have a quick hitch at all. Probably an upgrade when I’m older if we haven’t been forced off the place by developers by then.