After contacting Marat Fayzulling, who wrote the source this "port" is based on, I got the following reply from him regarding this as a port of his work:
"I haven't heard anything about it."
He's never heard of Yoshi, SonyXTeam, nor of a PSP port of his code.
So it's not an official port of the Mastergear code, or a port of extremely old Mastergear code or stolen code altogether. Since the code isn't released as open source, it's stolen code no matter how you look at it.
Does this website support stolen source code?
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