I don’t think that was his point. He’s simply saying that the benefit of reach and leverage makes it so that equally skilled and unarmored combatants would make it so you need 2 swordsmen to reliably fight a spearman.
That being the case doesn’t mean that they wouldn’t have multiple weapons for multiple circumstances, and it doesn’t mean that the appropriate armour wouldn’t impact it.
Finally, battlefield usage is a totally different situation as you have regiments with mixed skill levels.
I think the only thing he was trying to say is that if you have two guys with similar skill and fitness, unarmored, the guy with the spear has a large advantage.
Also, I think he’s a bit more than an Enthusiast. His resume is fairly impressive (www.matt-easton.co.uk/about).