So, it's basically somewhat of a podcast that's almost entirely in English?

Dunno, I guess you could listen to it. But you also need rote practice to calcify what you learn. That's what Duolingo is good at.

Everyone who has spent 5min learning Spanish knows what tener means. The hard part isn't knowing what it means, but rather practicing it so that you hear it, read it, and conjugate it on the fly.

Reading a grammar book end to end doesn't work either because you need the practice.

The whole question of language learning basically is: what daily practice are you willing to do? Not just what you want to do in spirit, and not just what you aesthetically prefer, but what you'll actually do.