The whole thing is 38 minutes, and the guy was kind of annoyingly promotional and excited, so I couldn't bring myself to watch very much of it.
The biggest problem with the review is that most of it is just a regurgitation of stuff we've already seen in an endless litany of A7Riii reviews (since the A7iii is so similar). The TLDR is that he loves Sony MILCs and the Sony MILC experience, and if you absolutely love EVFs and want a full frame EVF camera in the very near future, go buy a Sony. But if you're invested in a Canon/Nikon system, wait a little while to see what they come up with in the next year.
However, I could turn it around: "There are no Sony cameras nowdays that are a comparison to DSLRs for a lot of the stuff I like to shoot, so I can throw them all out of a window."
1. You can actually see the painfully slow autofocus at about 3:30 into it, ironically, after he dives into how gen 3 is twice as fast as previous Sonys. I mean, my Canon T2i autofocuses faster than that through the viewfinder, by a factor of, maybe, triple?
2. You can turn off the lights and AF on a 6DII or any Nikon DSLR with an illuminator; and you can't on a Sony For whoever mentions the Godox X1T... turn off the lights and try to autofocus with it. Just because it lights up, doesn't mean it actually works.
3. The A7iii and A7Riii are really 8fps cameras, not 10fps cameras if you care about seeing what it is you're photographing through either the display or viewfinder.
4. If you like to shoot above f/8, A7 series sucks you into contrast detect AF, which is horribly slow. Guess what? LOTS of flash photography is at f/11 or higher.
5. If you need to AF in dim lighting -- like some modelling lights that aren't super bright, especially through modifiers, an A7Riii's AF is just horrible compared to something like a Canon or Nikon DSLR.
6. He talks about Silent Shutter banding, but never mentions distortion on moving subjects, which is far more significant.
7. If you care about telephoto better than 400/5.6... well, I don't think I have to finish that sentence.
8. If you like mechanical MF lenses, you're SOL.
9. If you enjoy charging batteries, the Sony A7 series is definitely going to be a hit. He doesn't seem to think so, but I don't believe for a second that he doesn't walk around with a fully charged spare. Oh, he didn't mention, the A7iii doesn't come with a charger (you plug in a USB cable to the camera to charge it).
10. He would personally buy an A9. And he's got a whole bunch of A7R's and such. And he talks about shooting on the Nikon D5 and D850. But on the Canon end... he's comparing it all to a 6DII?
I could go on and on. The Sony is a great camera situationally, but there are many times when it's a very poor tool. I actually don't like most of the unique features that make it special; frankly, a lot of them get in the way of photography, in my opinion. There are a couple of EVF-specific features that are pretty awesome, but for me, it's not worth the tradeoff, at least not yet. There is a magnificent sensor, but for me, it's not worth the crappy autofocus.
As a second camera, I think it could work pretty well. But I'd never give up my 6DII for it.