You are the one who is blurring the lines. This is what was announced. It is as stated
All CWI engines offer customers the choice of using compressed natural gas (“CNG”), liquefied natural gas (“LNG”), or renewable natural gas (“RNG”) as a fuel. RNG is pipeline-quality natural gas produced from the decomposition of organic waste, which can come from a variety of sources such as dairy farms, landfills, and urban waste treatment plants. Combining Cummins Westport’s ultra low emission engines with RNG fuel provides additional and significant GHG reductions.