First, his linguistic analysis is broken (esp. the German vs. English one) - but others posted that earlier.
A simple (in)validation / common sense check should have taken place before running off too far - unfortunately it did not happen:
Ireland and US/UK speak (nearly) the same language - English. Yet they are on the (extreme) opposite sides of the scale, with Australia, New Zealand and Canada spread in between.
Switzerland, Austria and Germany (and partially Luxembourg, and with some bending Netherlands too) speak German (Dutch is close). All these countries are spread over the scale, too (even if to a lesser extent).
Silimar with French: Luxembourg (in parts), Switzerland (in parts), Belgium, Canada (Quebec) and France are spread, too.
Similar with Italian in Switzerland (top third) and Italy (lower third).
Similar Spanish: Chile in the top third, Mexico right in the middle, Spain in the 3rd Quarter.