It only follows this is a *A wide change if the operating carrier on the guests flight is billed for the visit. I always suspected it's the operating carrier on the Members flight that is billed for the guest, hence it costs LH money and this is why she stops it. Everything tells me Helga would be delighted if her lounges were packed with pax on Star flights to bill those SDR back.
It would be the case that a Gold pax flying Basia's incredibly premium cabins could guest a pax flying Helga's. That makes things rather complicated. Nothing new for Helga's Mixed Messages like her ecological approach to BOB leading to more plastic waste.