Keep calm people. It may be just a rumor.
It isn't a rumor when the author of part of the code clearly says his code has been infringed without due credit.
The author of the code can't know if it was infringed without seeing the source. The authors solver is slower, uses more VRAM, uses a lot more CPU, and PCIe bandwidth, runs on fewer cards, and crashes a lot. Why would you want to copy that?