Yep. If you ask Claude to create a drop-in replacement for an open-source project that passes 100% of the test suite of the project, it will basically plagiarize the project wholesale, even if you changed some of the requirements.
A full emulator in 6 minutes? I gotta call BS... I've been working on a SPC700 audio editor in the background as a side project, and implementing the cpu has taken at least 2 hours, and I still haven't implemented all of the opcodes.