The moisture content he measured after cutting it up was pretty crazy.

When it comes to Harley Benton, especially the cheaper models, I believe it's a bit hit/miss: some instruments had one or more quality issues during the assembly chain, others are crazy in terms of value for money.
I have a TE-62 I bought 4 years ago and never had huge problems in the wood department, except maybe the need to adjust the truss rod a couple times instead of once during seasonal changes.
I also have a JB-20 bass I got second hand and that never had a problem either.
I don't know how much difference there would be with a Squier of the same price level (e.g. the Bullet/Sonic range) as I never owned one, but basing my opinion solely on customer ratings I'd say HB is received slightly better.

After watching the video, I more or less agree, especially when it comes to a beginner guitar - if you're fighting moisture problems and the guitar setup is unpredictable every time you pick it up, you'll lose interest quickly as a beginner, or learn bad technique to compensate. Any beginners I talk to, ill generally steer them towards an epiphone, low end strat / tele (will i be sued by Fender for typing that?) or something used along the ibanez/Washburn vein.

Haven't seen the video, but I have tried both the low and high end HB guitars, and the low end are just crap, the high end are better than a Fender Mex or a Squire (IMO).