I think its a load of rubbish - I've never heard of a "standard" UK Mk2 with 2.0L - I think some the later US Mk2's might have a 2.0L engine though.
I've seen some Mk2's that have had a fettled GTI Engineering (a private aftermarket company) engine fitted soon after purchase, so maybe its had that (I doubt it).
I also like how theres a random pic of two spare doors, with no explanation. Presumably the existing doors are rotten.