agreed, IGBT's aren't that new. however the process and specs of VERY high current IGBT's may be the kind of intellectual property they have acquired...
just like integrated circuits have been around since the late 1950's or very early 1960's, but the ability to make the latest/greatest Intel CPU is the 'secret sauce' that only their chip foundries have. Similar for the RAM and SSD storage, yotta yotta yotta.