I found your video on youtube before finding this post here. I find watching prints can be really mesmerizing. And this one was - right up until the fail. I've woken up to find those on my printer a few times and my stomach drops out every time. With that much filament into the print I can only imagine the feeling ... But really a quite nice recovery! Congrats on the finished product! Are you gby ajdtreyd - Look what I made!
This is fairly common issue with deltas. You'll find MANY threads discussing this in the SeeMeCNC forums. Basically you need to make sure every tower is as close to perpendicular to the bed as possible - even 2-3deg of lean in or out can effect calibration. Once that is as close as you can get it, run through the calibration wizard here: escher3d Calibration Wizard If you don't have a z-probe liby ajdtreyd - Delta Machines
I have the authentic Bondtech as well as the trianglelab. The Bondtech can print as fast as I want (up to 150mm/s so far) with no issues on my delta with a 600mm bowden. When I received the trianglelab cloned unit I had the same issue as you - could only print very slow speeds. To even reach 40mm/s without grinding the filament I had to drop jerk below 600 (from 2100mm/m) and acceleration to 600by ajdtreyd - Mechanics