A lot of interesting comments on that video. One in particular seems remarkably similar to that on Bachmann 37 thread.
As mentioned above, this was a very large run and thus will likely have higher numbers of duds. But whether its proportionally more, Accurascale have said it isn't.
As for the derailment issues in the video, the Bachmann 66 also has form for this.
I guess because we're paying more, people are less tolerant of duds; and speaking anecdotally, post covid, we seem to be in a much less tolerant world anyway.