They are saying that those particular fonts with that particular kind of font-rendering engine (windows), doesn’t work for them for that particular language.
Sure, but if you read their comment, it is conditioned on all of those aspects together. It's not about the language, as is, but all of them together. Is it a useless comment? absolutely! But that's beyond the scope of this conversation.
I find the title case ugly, not a fan of semicolons, nor the new keyword. Guess I'm too used to Kotlin and Linux/Mac fonts