I can't comment on all of their videos, but any of the techquickies I have watched that are about fields within which I have particular expertise (Video Coding/Compression, Error Correction Coding, Electronics etc) I have found their information to be at times inaccurate, at others just wrong, and always very, very oversimplified. I'm willing to be wrong, but I don't get the impression that they do a whole lot of research.
I get that they're supposed to be really quick little videos, but maybe the times they are trying to achieve are simply not enough to cover the complex topics they are covering. Channels like Tom Scott and CGP Grey do a MUCH better job at explaining things in short videos.