Nice idea, but not robust for the bigger augers. My machine is a full CUT, the vid shows an SCUT.
Here's a robust one I made last decade and it's still holding today.
2X 6X6 SQ posts and a 6-in dia 6FT fence post. There are 2X lag bolts that act as line-up pins for the fence post. Put the auger on, the weight keeps it down.
The round fence post helps so much because lining up the tractor is not longer a big deal, the round post allows the auger to swap right or left when hooking up to the 3PT. Not shown is the bungee cord holding the PTO shaft to the top-link mount. This way, it doesn't get dirt inside the spline.
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