I don't see why Marc's comment needs to be read as a dig?
It's simply stating a true fact that you are pleased with the work you've had done and have the logo of theirs on there as it displays the carbon. If someone sees your car, they'll see the logo and - potentially - check out Nur Motorsport. Whether your intention was to help promote the company or not (which, as you've stated, it isn't), you are still "advertising" them. That's not a difficult concept to comprehend surely.
There was no suggestion (from Marc's comments at least) of you having the logo there to try and get money off or for sponsorship or anything else.
Back to the actual topic of the thread - it looks good. I'm glad you're happy with it!