Answer

First, when you bring a quotation, it is proper to mention its source and context.
Apparently the intention is commandments that are not connected to prohibition and permission. It could be interpreted that, for him, prohibition and permission are certain categories, and not all of Jewish law as a whole (what we nowadays call “prohibition and permission” is part of Yoreh De’ah). Or perhaps he means commandments that impose no prohibition or permission on us at all, such as positive commandments 95-96 in the Book of Commandments and the like. The same applies to the rules of the Talmud and Jewish law, which in themselves do not impose any prohibition or permission on us.