That's true, but the convention for educated English speakers has it that it should be "you and me", or "us". They may have succeeded at communicating facts but

That's true, but the convention for educated English speakers has it that it should be "you and me", or "us". They may have succeeded at communicating facts but they also conveyed some slight ignorance to some subset of people reading it. Definitely wouldn't have taken the time to point it out, though.