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I assume you're referring to Adrian "carbon wasp" Smith
https://youtu.be/5gFyqFGtqsM
I think he's upped his game a bit since those days tho
last interview i read he was talking about printed moulds and custom silicone bladders
There is or was a guy in the UK making MTB frames like that but without a mould, I think just wrapping a 3d print then vaccum bag and dissolve the plastic.
Edit: found him:
https://bicycledesign.net/2015/01/3d-printed-mountain-bikes-by-adrian-smith/