>>420324967
Working development prototypes getting cancelled generally just means they wanted to go a different direction for whatever headset it was going to end up releasing as, which makes a lot of sense if one of those really was the Quest Pro 2.
Worth mentioning that UploadVR, which they listed as their source, seems to think Cardiff was some kind of Quest 3 Plus. I think something like that could've actually worked though, so maybe Quest Pro 2 is more likely.
https://uploadvr.com/meta-cardiff-canceled/