Lots of tecniques in Aikido can also be executed while kneeling (and are subjects of the exams) so tecnique wise I'd consider it pretty accurate, also to move the old man is doing Mae-Sikko (a foward movement while on knees) but in reality one needs to raise the advancing knee and then lower it again while rotating the hips, looking at the illustrations of him not raising and doing it on concrete hurts me XD