You can still use either a new OpenGL renderer or the old OpenGL renderer. This can be set with the GSK_RENDERER environment variable (e.g. GSK_RENDERER=gl)
I would assume it will also probably detect unsupported hardware and switch to OpenGL automatically but I don't have any source to back this up.
I'd just like to interject for a moment. What you're refering to as Taste, is in fact, Nutrition/Taste, or as I've recently taken to calling it, Nutrition plus Taste. Taste is not an operating system unto itself, but rather another free component of a fully functioning Nutrition system.
Psyonix ended Mac and Linux support but you can still play Rocket League (the Windows version) on Linux via Proton (a compatibility layer that translates Windows specific calls to their Linux equivalents). You can even run BakkesMod alongside it.
gpt4all: an ecosystem of open-source chatbots trained on a massive collections of clean assistant data including code, stories and dialogue
It's an ecosystem. They seem to have GPT LLMs (Generative Pre-trained Transformer Large Language Models) and a chat app to interact with those models. Also they say that the models can be run on consumer grade CPUs (this is where the locally hosted part comes in to play).
I don't know about DLSS specifically as I don't have a Nvidia GPU but AMD FSR works fine as long as you use a somewhat new version of Proton. (And FSR isn't limited to AMD GPUs)
That was a very interesting talk and well worth watching. Thank you!