Yeah ToyBiz basically pioneered that way of sculpting back in the day. They had scans of nearly the full cast. Which is weird that they ended up with a good number of duds in likeness (Mirkwood Legolas comes to mind, but their original FOTR Legolas is tremendous). Nevertheless, I'm surprised we don't hear about or see that tech more often now.
I wonder how Asmus could procure those scans, seeing as ToyBiz is long defunct. I wonder if Weta perhaps has them too? But I think they sculpt by hand digitally? I'd have to imagine that Weta probably has almost every actor scanned on file for CGI doubles during filming too.
All that to be said, there's something to an artist sculpted head. Hot Toys are fixated on hand sculpting, as are the other big players. It's a sort of status thing, I would seem to think.