If I am not mistaken, this waza is illustrated on p.139 of Kisshomaru Ueshiba's "Aikido", where it is called "ude-hishigi" (arm-smashing
). I would suppose that K Ueshiba regards it as relatively advanced, since it is shown as jo-tori.
I say, "if not mistaken", because I have heard it called 6-kyo only in the US. It was a favourite of M Kanai, though he also taught the correct ukemi for it.