Where's the source for that?
Because everything I've ever seen is BMW bought the rights to it not Loncin......they just assembled it, and now they assemble the engines for the 700/800 series.
The new G650GS is essentially the 2007 single-cylinder F650GS brought back into production with some minor modifications and with the engine assembled by Loncin in China instead of Rotax in Austria, but still using parts manufactured by Rotax in Europe.[2][10][11] The finished engines are shipped back to BMW in Germany where the bikes are assembled. G650GS models with the Chinese-assembled engines can be easily identified as the engines are painted black while in the earlier European-assembled engines were finished in silver. Before the bike was discontinued in 2007, there was a brief period when the engines were assembled by Kymco in Taiwan.
https://en.wikipedia.org/wiki/BMW_F_series_single-cylinder