There are different ways to read “yosheiv ohalim.” It can mean tents for shepherding and sleeping al pi seforno and others, or al pi rashi it’s a tent of Torah.
But as on the ball says, it’s hard to imagine yaakov learned the whole Torah and Gemara. What would zechiras amalek mean to him, for example? I prefer to say that intuitively yaakov was a tzadik who knew right from wrong, emes, and was able to communicate with Hashem. He was so great, he didn’t even need the hora’ah from the Torah in order to be a good person!