That re-write lists its license as MIT, not GPLv2. Is that legitimate? e.g. in general, can you re-implement a library with one license and change it to a non-compatible license?
From everything I've read I'm pretty sure that if it's a complete rewrite in another language then it's legally "divorced" from the original project. You can own (and ergo license) an implementation of an idea, but you can't own or license the idea itself. Same with patents - you own the how, not the why.