Again, I'm not a switch-scientist. And it's clear you aren't either because all you say is "this is fact, TRUST ME I KNOW THESE THINGS! I talk to people who examine stuff. I'm bigly smart about switch stuff! That's all the proof you get."
When you can explain, with screenshots to show how, 16kb of data appended to an encrypted NCA that is otherwise identical to a provably functional NCA and how it isn't harmful, then you have grounds to call yourself an expert. Insisting on being right without proving it is childish. I'll keep pointing at the encrypted NCAs with extra data being byte-for-byte identical for the majority of their contents up to the end as a reason to think C2C is a frankenbuild until then.