I know the guy put a lot of thought and effort into this movie but I am sensing some bias.
1. he lists the K31 as a great gun and mentions that "dies, Brass and bullets are readily available for it" yet when talking about the enfield he calls 303 brit "a reloaders golden girl because 303 brit has no surplus left". now I'm aware that all of the surplus stuff petered out about 10 years ago and I got really lucky when I picked up 1600 rounds of HXP surplus a couple years ago but everyone makes ammo for it. remington, federal, PRVI, wolf, winchester and sellier and bellot all make ammo for it, not exactly what I would call a "reloaders golden girl".
2. he mentions the M98 mauser and loves the GEW98 to death but that movie is a bit deceiving since he mentions yugo surplus ammo and the great groups he's gotten when the early GEW98s are not rated for the more modern 8x57 charges.
personally for me I would list it a bit differently.
1. mosin nagant, even though they are one of the most crude, clunky, and least refined(if crude wasn't enough of a descriptor) rifle designs ever fielded, I still think everyone should own one. they are still one of the cheapest, shoot one of the cheapest rounds, and are still pretty fun although I will disagree with the movie maker in that they make horrible sporters, I've tried several different renditions, nothing was quite "all there". personally I have never shot any that were capable of better than 4 MOA accuracy with standard ammunition.
2. enfield, for all of the reasons he listed, the enfield NO4 MK1* was the rifle that got me into milsurps in the first place.
3. a mauser of some sort just because although I personally prefer the swedish variants as a #### on close just feels nicer during cycling and the 6.5 swede cartridge is far more useful over range as a hunting cartridge.
4. rather than the M1 garand, I would say that a springfield 1903 is the must have 30-06 rifle in a milsurp collection. the M1 has several drawbacks and though I generally shoot mine well, I will not claim that it is perfect. experience with springfields has been more stellar as far as accuracy, reliability, and fun to shoot goes... maybe I am also biased in that I don't like to root around for brass flung every which way by a semi auto, but if given a choice I would take a nice 1903A3 over a springfield anyday... unless the M1 was made by international harvester... those are RARE!!!!.
5. many people likely disagree on this but rather than the K31, I would recommend an Arisaka of some sort, preferably the 6.5. I love my arisakas and get great accuracy compared to most. yes the swiss have a better track record and more readily available ammo(the arisaka family is definitely a reloader's golden girl), but the arisaka is more of an oddity. I notice that the author struggled at a few points when trying to demonstrate the straightpull action while expertly cycling the rest of his top 5 by instinct, the arisaka is much like cycling an enfield without the benefit of a bent bolt.
everyone's different, I'm just adding my 2 cents. oh and I only have 3 of 5(enfield, garand, and 91/30)