That's not the upstream source. You're looking for this:

https://github.com/Tencent/HunyuanVideo/

This isn't "too good to be true" - this is the holy grail. Hunyuan is set to become the Flux/Stable Diffusion of AI video.

I don't see how Hunyuan doesn't completely kill off Sora. It's 100% open source, is rapidly being developed for consumer PCs, can be fine tuned, works with ComfyUI/other tools, and it has control nets.

I've ran hunyuanvideoai from their GitHub and it seems to generate realistic videos. It is a bit slow (30-60min per video clip) and requires ~50GB VRAM. I wonder how the quality compares though?