Yeah, that is true - I just checked it. Can't say how much more battery it uses in a complete cycle but I can see it can go up to 10 energy usage and 10% cpu, which is surprising. But at the same time Discord is using 20% cpu. Should I delete discord? I don't think the impact is as dramatic that it would be worth not using the touchpad. If you are sitting on a desk, you would be using a mouse anyway (at least I always do) and if I am moving the laptop around / in bed, or whatever, I would be using the trackpad.
It's just not convenient to avoid using one of the very best features of the mac to achieve a theoretical 10% battery increase (not realistic since you will not be using the trackpad 100% of the time anyway, and it jumps to 10% usage when I constantly move it).