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I'm 95% certain that it is one of the 2 slate greys.
The lighting is tricky but IMO based purely on the contrast with the black accents of the car, 3 of the 4 images look more like slate grey 615. That said, in most lights I find 615 to look brownish green and this does not.
The last image (attached) however looks very much like y97 (attached).
Sorry my answer's not more definitive but In any event it's beautiful and I'm still happy with my Y97 choice for the GT4!
Porsche calls it Grigio telesto metallic but in viewing the paint sample at Porsche exclusive the metallic is virtually imperceptible so I am thinking there is still a good chance that it's the color.
Here is my 615 Targa in the sun on Saturday. Just taken with my phone, color changes a lot based on the light as expected. It is actually very close to how the historic 615 looks from memory, but I haven't parked it next to one yet.
Car still needs a detail, but gives you an idea. That is a very dirty DBM Macan in the background.