I don't see what the problem is. Looks like a perfectly fine way to change your oil. Certainly no worse than all my neighbors who regularly work under their cars while it's held up with a bumper jack.
The manual for my 1980s Japanese-build John Deere 1050 makes it quite clear you should never go underneath something that's only being held up by the hydraulics. I admit that requires 1) being able to read, and 2) actually reading it. But everyone I know was either amused or horrified at the variety of warning stickers on recent farm equipment. I can't find an on-line picture of my favorite, and I'm 3,000 km from my tractor, but it's a stick figure wrapped 1 1/2 times around a PTO shaft, arms waving wildly...
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