I thought his tips in the video seemed pretty reasonable.
His points seemed to be:
1) Save more and invest in stock ownership / automate this so you aren't tempted to dip into savings
2) Pick an asset allocation
3) Minimize fees
4) Own US stocks
There's some "downturn is an opportunity" type comments throw in, but my bet is that's just a behavioral device because many millennials (who the video is specifically targeted to) are reluctant to buy stocks because they lived through 2008 in their formative years. And, since he talks about allocations, these could just be comments about rebalancing.
Ultimately, I don't think this video is "how to invest" but more "you should put some time into learning how to invest". In that light, I think his tips are pretty reasonable.