Dear Yserbius,
To my knowledge, the only High School in Rav Schneur’s day had English. (Unless Mesivta of Lakewood was around forty years ago. I think not.) To be polite, let’s just say that he did not send there. We can’t infer an approval for English from that. Moreover, I would expect him to be against it. He was born and learned in Europe. Though almost all of his talmidim supported English. The current Rosh Yeshivos of BMG, are American. I think two had secular studies and two did not.