This seems to be exactly the consensus. It seems that Carmina may layer a very slight acrylic layer on to the leather.Saphir Reno Mat is good for removing cream and polish without removing the underlying dye from the leather, in my limited experience.
But it's interesting you mention this issue, as out of all my varying ages of shoes and boots, the Carmina pair I have are the most tricky when using shoe cream, it seems to sit on the surface rather than get absorbed. It could be that they use some kind of factory coating, I haven't tried Reno Mat to see if I can get through it, I just wiped off the cream and they look great so am leaving well alone.
I have antiqued several Allen Edmonds and Rockports (yes, I know, junk shoes - but I made them look nice), and never had a problem. I have sometimes had polish rub off, but just a little bit, and only directly after polishing and that was due to me leaving too much on.
I will tell my mother to get some renomat so that next time I visit her, I can go and fix her boots.
To put it into perspective: my mom sat on a bench outside Ikea and left red pigment all over it where her boots had been resting.
I mean, just outrageous amounts of leakage of pigment, which is completely opposite everything which has ever happened with other things.