What about steam cleaning?
My experiences with the Honda/Acura Line is that they use a thinner slice of leather than for example, the German marques..
Then they perforate that thinner leather which makes it much more fragile, and of course, there is less surface area for the color coat to adhere to..
Perhaps it can take someone rubbing something abrasive on it, but I would never consider doing that to this car ever..
Yes, perhaps lightly hitting it with steam may help, but I would not do that without having my extractor in there at the same time, to immediately, carefully, using best judgement on how much extraction water lift is at the tool, see if the stain can be lifted up and out..
Again, its perforated, on top of being a thin slice, so be gentle, have great lighting, and see how it goes, good luck !!!
Just thought of something - is that stained area wet or damp?
In my experiences with some vehicles where the windows were all left open overnight during a rainstorm, the seat foam, can absorb a huge amount of water, and it will absolutely NOT want to release it easily..
For that issue I had to use my Mytee HP60 extractor on the seat foam for hours to slowly but surely extract a LOT of water out of every square inch that was flooded..(gallons) Then, I had to blow really nice floor fans on all the areas with heat lamps, to eventually get all the water out of those seats foam.. No, I couldn`t put the seats outside, it was in WA where it can rain forever sometimes..
Dan F