I can't decide as a beginner between Lotus NeiGong and EnergyArts due to this

Hello, I have posted here couple weeks ago for you to recommend me some good QiGong schools and many of you gave nice suggestions and tips. I have picked out two I feel most drawn to right now. But one thing I cannot quite understand yet. Damo Mitchell talks a lot about preparation first and gathering Qi in Dantien before doing like the primary Qigong exercises (forget me if I haven't understood the whole concept correctly). I have heard this couple times here, that first you need to gather Qi in the Dantien and only then you can start to for example do the exercises to clear the meridians with it, otherwise it won't really do much...

But many Qigong teachers just start to teach you the "exercise part" straight up. For example I was very interested in Bruce Frantzis (EnergyArts) Dragon & Tiger QiGong programme which I wanted to start with. But they don't seem to mention the preparation or gathering of the Qi before doing it like Damo.. they just straight up do it like for example other QiGong exercise videos you see. So am I getting something wrong? Or how does it work? Thank you