I think they're forgetting about diet, fitness and not drinking. Neville might not have been a big drinker, but I bet he would have been drinking way more than the biggest drinkers on the European sides. People like Keane were massive drinkers, nobody is going to convince me he drank less and was in better shape than his opposition?
The Europeans where about a decade ahead of English players in that respect. In a game where the skill margins became smaller and smaller, things like fitness and diet etc play a much bigger part.
That's not saying the Europeans and south Americans were not more skilful mind, as they were, but that is down to the football when they're growing up, it's a lot more technical (or it was). If you're skilful enough to retain the ball, you can pass the opposition to death, and even if they're just as fit as you, it doesn't matter, as they're not as fit as the ball. Like the old saying goes, "the ball doesn't get tired, but the people chasing it do".