I knew Fr. Adam Purdy at the seminary -- for 1 year at least. Obviously a Humanities (0 year) seminarian like myself wouldn't have any classes with a 6th year seminarian -- who was already a deacon when I arrived.
Nevertheless, I did speak to him several times during that year, at various group functions.
I can say this: he is a typical American when it comes to languages. He only knew English and had an AVERAGE SSPX seminarian ability at Latin. He wasn't one of those seminarians (the "nerds") quoting or speaking Latin for fun. And he didn't know French, Spanish, or any other language -- at least not that I ever heard. He certainly was very comfortable socially -- he was probably one of the popular kids in high school. Actually, now that I think about it, he was more of a "jock" than a "nerd" at the seminary. He certainly had none of the common nerd traits: nervousness, self-consciousness, shyness, awkwardness, over-thinking things, etc. And yes, the seminary has those differences among the students just like any other grouping of 50+ young men (a high school, for example). Now obviously there was no real animosity between such opposites, like in a public high school -- certainly no swirlies, wedgies, or other abuse of the nerds. Some guys loved their sports. Other guys would have preferred to build a computer during recreation, if that had been possible and allowed. I tended to enjoy the company of the "nerds" for some reason...hahaha
(There were white collar/blue collar and country/city dynamics as well. Not to mention English/metric, America/every other English speaking country, etc. A very horizon broadening experience! I learned that not every family in the developed world stocks peanut butter as a staple. Only the Americans!)
He was from New York, via St. Mary's, KS if I recall correctly. I don't know his ethnic background (For a white guy he has plenty of melanin and brown eyes) but any ethnic "variety" he has is only in his DNA -- not in his culture, upbringing, language, etc. He's a typical American.
My view of him as a priest is one thing (and that's problematic at best...he's still with the compromised neo-SSPX, even though he was ordained while +Williamson was rector! He should know better.) but I wouldn't follow him on language matters any more than I'd seek out modesty or fashion advice from the Kardashians.