So that's conclusive - at least, assuming they're using the Omega thiolised yeasts, at 7:06 he says that Dataset #4 uses "a thiolised yeast strain...based on the base yeast strain that's utilised in Dataset #5". And Dataset#5 uses "a classic European yeast strain that was sold to us as a phenomenal maker of hazy IPA". (9:06)
Omega has only done thiolised versions of their Chico (West Coast Ale I), 1318 (British V) and Mexican Lager. So the working hypothesis would be that #5 is British V and #4 is a thiolised British V, either the original IRC7 Cosmic Punch or the more powerful patB Helio Gazer.
He's a bit vague about the parent strain of #2, but the way he says that it's drier makes me wonder if that's a thiolised Chico, which from Omega would mean the patB Star Party.
One wonders if they are all Omega yeasts, in which case #3 would be one of their eight British ale strains - if they're used to using S-04 then I or II are their Whitbread strains.