YUCK! I remember those from the late eighties when I worked in a TV repair shop and we had a flood of them coming in, a large hotel in town had one in every room and the precisely engineered lifetime must have expired, it was a special hotel version with a lock on the lid over the channel setting buttons and a short piece of chain attached to the rear so you could anchor it to a table or something.
The schematic was on a single small piece of paper and it did not match the actual circuit very well, they had a funny failure mode, the high voltage became to high so the picture shrunk and it started to emit a lot of very disturbing crackling and popping noises, the hotel guests must have been surprised. The transistors were all Japanese and a bit hard to get hold of then, possibly even harder now.
I don´t remember the details now but the TV in your video seems a bit more modern than I recall, maybe the sets I worked on were a bit older than yours, there would also be a slightly different version in Europe.