Those things are LLMs, with text and language at the core of their capabilities. UIs are, notably, not text. An LLM being able to build up interfaces that look

Those things are LLMs, with text and language at the core of their capabilities. UIs are, notably, not text. An LLM being able to build up interfaces that look recognizably like an UI from a real OS? That sure suggests a degree of multimodal understanding.