1) I believe Google has stated it won't be "cheaper", and I think he is insinuating you won't be able to get those games on sale (logical, since the platform hasn't even launched yet) like you can on other platforms (his $4 example for Tomb Raider). But yes, "full price" is vaguely defined in his video so I could see where people would be expecting the $60 USD price tag with this speculation. I understand the confusion there.
2) It is not untrue. Google has stated that the 4K is only for Chromecast (and only the new Chromecast that comes with the Founder's Edition), and users for PC/Chrome browser will be restricted to 1080p until sometime in 2020.
3) Basic isn't available yet. He did reference "future models", but he's talking about launch Stadia.
4) Did he say that, or say the library isn't free (aka included in the sub) like it is for PSNow? I know you get one free game per month, and they haven't stated what those games will be yet. If he neglected to mention that as part of the subscription, then yes that's a piece of information he left out. I recall him comparing it to Xbox Live Gold, which is similar except is only functionally needed for some multiplayer games.
5) Again, this is true at launch. You can only access it with the Founder's Edition Chromecast, as they have stated the older Chromecasts don't have the proper firmware yet. This is, of course, assuming you don't already have a PC (with restrictions) or possibly a Pixel 3 or 4 phone (phone gaming is a whole other territory I guess)? For the majority of gamers (particularly console gamers, i.e. the market Stadia is meant to compete in), the only way in currently is the Founders Edition.
Stadia won't have family sharing, achievements, or 4K streaming on PC at launch | PC Gamer
I think the "bias" is that he doesn't see the use case for the Stadia for existing gamers (such as himself, a gaming YouTuber) at this time. That's a fair observation IMO, that could change as the service matures.