The wash plate does comprise the bottom of the basket. It wouldn't work by rotation, there isn't enough water for that. The water level is always below the wash plate, the clothes do not get submerged, only showered and bounced.
The quilt was washed on the designated "Bulky" cycle which consists of more shower/spin action than bouncing (nutation), for purpose of thoroughly soaking bulky/overstuffed items. What nutation there is runs at 250 NPM for brief periods. There are several nutation speeds ranging from 150 to 300 NPM. I ran a small load of shop rags on Heavy Duty, and there was so much splashing I couldn't keep the lid open. Spin speeds range from 400 to 800 RPM. 60 RPM for the spin/showering.
The machine isn't as noisy as it seems in the video. My camera exaggerates the sounds. The Calypso specimen I have seems to be in good condition in regards to the wash plate, u-joint, seals, etc.