I think it was this video below where explains the deal with not building assembled transmissions for a while. Sounds like he just needs time to get caught up on orders and cannot find another good employee to help. Still selling parts and has those full kits of all the parts used for a build. Check out the video.
I used a local builder here in San Antonio that did an EXCELLENT job. He too is way behind on builds and cannot find anyone to train in his craft. He will be closing the business after many decades because he just cannot do it all himself anymore. Sad indeed.
