It is a notable change. Aren’t Russell Karting the ones responsible in bringing IAME/Parilla to the US in the first place? And reading a press release from one of the former importers, this change was completely unexpected.
I don’t know if this is the right place to bring it up, but this new development ties into the trend that, at least on the national level, the late Tom Argy’s concept of TaG is all but dead. Now, instead of several engine manufactures competing for TaG supremacy on the race track, it’s several single-make TaG programs battling each other for a piece of the marginal karting consumer base.