Yeah, Mitchell's description is very confusing.

   libghostty-vt 1.0 is here. libghostty is a portable, high-performance C library for terminal emulation, extracted directly from the core of Ghostty.

I came to check and say the same as well. I was thinking if they used AI to convert Zig to C.

And that is with me and everyone else knew it was coded in Zig in the first place. Had anyone not knew what Ghostty were I seriously think they would have thought it was a "C Library".