It doesn't have code completion. You can install it as a feature, but vim itself doesn't have that feature. There needs to be a law for someone either flat out lying or not knowing what they're talking about because godwin's law doesn't apply here.

Additionally installing these features on vim is a nightmare for various reasons. It can be done, and I've done it, but the experience is not as good as the more clunkier GUI IDEs. I'm all for a TUI IDE if the experience was as automated or seamless as jetbrains or M$, but such a app doesn't exist yet.