Didn't watch the video... but the premise "The biggest barrier for the new Linux user isn't the installer" is exactly why Microsoft is, sadly, dominating the end-user (not servers) market.
What Microsoft managed to do with OEMs is NOT to have an installer at all! People buy (or get, via their work) a computer and... use it. There is not installation step for the vast majority of people.
I'm not saying that's good, only that strategy wise, if the single metric is adoption rate, no installer is a winning strategy.