Hopefully just a one off. Motorcraft have recently had a Roamer battery fire and that has unfortunately become a bit of a bun fight between them and Roamer on FB.
Faults occur for the most obscure reasons and in the case of that badly bodged cable splice it could just as easily have come off the cable drum like that.
No pfy in some sweat shop would have been allowed let alone empowered to take the time to check a splice covered in HS.
I don't know if I could agree with that.
I think it is very unlikely a cable join like that would be on a roll of cable - you have the cable and it has the insulating sheath on and that is what you get on a cable roll. To join a cable the sheath would need to be cut back for the join and then recovered by 'something' (and something a lot more substantial than heat shrink). This would be very evident when the cables were pulled off the roll to be cut to length.
So #1 - if for some reason the cable supplier HAD supplied a cable like that (which is very unlikely), the people making the cable lengths would have noticed it and either rejected that drum - or more likely removed that section and cut a fresh length.
It is possible that the copper cable was joined prior to the process that applies the insulation sheath over it I suppose but I would again find that very hard to believe. It would be more work that is worth while when making 100M drums of cable to start joining cables. And again the join would have been very obvious with a bulge - which itself if seen in a cable coming off a roll would be a cause for alarm for anyone working with it. Even just a twist on a heavish cable on a roll makes an odd bulge which won't go un-noticed (and probably cut out when making a cable. I would/do).
The fault will clearly be with the company who are making the actual end-to-end cable of length of maybe 10M at the very most (and more like 5M probably) cutting lengths of perfectly ok cable from the drums, and in this case instead of getting a new drum when the old one was short, jojning it with another left-over piece to make the required length. In a production environment it is a remarkable thing to do as doing this is actually far less efficient time-wise then getting a new - correct - length of cable.
As far as I can see there is only one company that is to blame for the production of a cable as shown in the video - and that is the one that makes the finished cables with the end connectors on and the braiding put on.
Any part of the process before that, a cable join like this would have been extremely obvious.
Any part of that process after that, the join would have been hard to spot.