I think we should settle this in a more constructive way. We use this terminology, because we can not describe this effect better.
STG, before you start to shout and asking for proof, remember that you are just as unable to prove that #26 won't change the appearance. Yes, the paint will stay very nearly the same color as before. But, it will be darker (how?), richer (how? what's that?) and warmer (huh? how?). The active ingredients render the optical qualities in a certain recognizable way. That's what we are discussing.
No one questions the darkening effect, a richer appearance or a silver ghosting of an old-school sealant. If you don't know what I'm talking about, well, this effect was/is a special refractive *feature* of certain early sealants. From flatter angles, a silvery reflection (what we call ghosting) appears, and it can wash out/hide/overshadow the original color in a pool of silvery splash of light. When the angles change, the ghosting disappear. The term *yellowing* tries to describe a similar effect, although the colors are always visible and exact. However, what others call rich warmth (try to describe it better; if spot on, we accept) is actually a shift in the overall light reflection spectrum or range.
Colors can and will influence the subjective results. More than ten years ago, I performed an interesting test. I colored the same sealant with drops of food coloring (red, blue and green) and painters and body shop guys were overwhelmed by the pink one and basically didn't care for the others. Oh yes, the colors of the cars remained the same...
Once again if you don't get it: it is not the paint what "yellows". If you broaden the abilities of your vision, you may be notice a very subtle golden undertone of the glow (can you describe glow? - no, not phosphoric wax...), which are noticeable in the reflections which follow the contours of the car but also present on the *aural areas* of the surface . Unfortunately, the term itself is often associated with wax buildup.
Unless you find an extremely lucky angle to show this, it is almost impossible to demonstrate. We cannot prove that a wine tastes like forest earth tone, or an analogue recording contains more details and superior natural staging next to a digital one. These are ultra fine resolution sensory differences. Some of us can detect them, some not. But still, the effect is there. It is a visually holistic viewpoint which requires more from us than a single, hasty analytical glance. Science is for Dexter... and I'm glad indeed, that I'm able to detect such fine, subtle, subjective hues.
Pretty awful looking IMO though, at least compared to the pearls I *do* know about...to each their own..
At least your camera's matrix program doesn't do *that*.