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Crap. I wanted to like this video.
Unfortunately this starts with bad information and gets worse...claiming Yellowstone is the largest super volcano....but Yellowstone's biggest eruption was 2,800 km3 almost 9000000 years ago.... Toba in Sumatra erupted 13,200 km3 only 75000 years ago. The most recent Yellowstone eruption was around 640000 years ago and only 1000km3.
Even Taupo ejected 1170km3 in that last super eruption, far more than Yellowstone's most recent.

Where did they get the idea that an ash cloud would spread in every direction evenly?! It's just wrong. The ash cloud would be blown East by upper atmospheric winds...eventually circling the globe but not expanding to the West very far....just like previous eruptions did.

They mention America going abroad to get food in such an event, then go on to mention global dimming, temperature drops, and sulfur contamination damaging crops...but don't put the two together. In such an event, no country on earth could feed it's own population, much less have a surplus to sell to the worst hit area, America. In 1815, the year without a summer caused world wide famine, epidemics, and a halt to shipping because winter ice packs remained through the summer in many places, and crop failures and epidemics continued for years afterwards. That eruption was only 160–213km3 and there were under 1 billion people to feed on the planet.
A large Yellowstone eruption would be 4-10 times that size, with effects being worse and lasting longer, and there are around 8 times as many mouths to feed.
The largest eruption we know of was nearly 100 times the size of Tambora in 1815....and wasn't Yellowstone.

https://en.m.wikipedia.org/wiki/Supervolcano

Edit: let's not forget the disruption to airlines for possibly years and interference with satellite signals like we've never experienced....and what does that sulphur do to an already acidic ocean?

I want to know his sources, because they don't jibe with historical records.