This is just meant to show how awesome their toolkit is, without the goal of having fair comparison. They list chart widget, but they do not list 3D chart widget, because then they would need to show that they do not have it, but Qt does. Same for equivalent of QGraphicScene etc.

Truth is Rust doesn't have, and will not have anytime soon anything comparable to Qt or VCL/LCL. No amount of GitHub starts and "made in Rust" disclaimers is going to change that.