That's it.
This is all about them giving assurance as to wether the longevity is affected or if it's purely cosmetic .
My assumption ? Is that they must believe it is purely cosmetic of they wouldn't still be selling it?
Have you (the OP) been back to them, quoting studmuffin, that high silicone content can reduce adhesion and bring about delamination ..... And can they give you assurance that isn't the case ?
Their answer will dictate where to go next.