What is massas ?
Do you mean matzos.
Nobody says massas they say either matzos,matzot or matzoth.
He's into the pronunciation that Rabbi Bar Chayim teaches. He acutally meant to write massot. By ss, he means tzadi. He spelled it massas to make it seem like an English plural word.
I think it's silly that people think the singular is matzo. When I see it that way, I just read it as if it said matzah. If I see the plural spelled matzos, I read it as matzot.
The English is matzah and matzas. The Hebrew is matzah and matzot. The Ashkenazic Hebrew is matzah and matzos.