That is not correct. Simvastatin is made up of a similar compound found in RYR, however it was developed from the common Oyster mushroom. Simvastatin is a member of the statin class, a synthetic derivative of a fermentation product of Aspergillus Terreus, or the common Oyster mushroom.
"In the late 1970s, researchers in the United States and Japan were isolating lovastatin from Aspergillus and monacolins from Monascus, respectively, the latter being the same yeast used to make red yeast rice but cultured under carefully controlled conditions. Chemical analysis soon showed that lovastatin and monacolin K are identical. The article "The origin of statins" summarizes how the two isolations, documentations and patent applications were just months apart.[2> Lovastatin became the patented, prescription drug Mevacor for Merck & Co. Red yeast rice went on to become a contentious, non-prescription dietary supplement in the United States and other countries."
Really the comment is not about how commerical lovastatin is made, but rather that when you take RRY you are getting a lovatatin of unknown quality and strength.