Meh. So his statement that all you need is a helmet that passes a std and they get no better is simply not true.
It is not to say that $ make the difference.
Snell and DOT unfortunately are outdated and examples of trying to do the right thing, but failing.
For road helmets I'd trust the UK Sharp testing more, just because it is decades newer and they have learned where the old stds create artificial tests, like the double pointy object test.
They have a 5 star rating rather than just a hurtle to pass clumping them all together and giving the impression that all the pass helmets are the same.
https://sharp.dft.gov.uk/