Keep in mind the original X Elite benchmarks were never replicated in real world devices (not even close).
They used a desktop style device (with intense cooling that is not possible with laptops) and "developed solely for benchmarking" version of Linux (to this day X Elite runs like shit in Linux).
This is almost certainly a premeditated attempt at "legal false advertising".
Mark my words, you'll never see 4,000 points in GB6 ST on any real products.
You're still using a platform upon which Google has an enormous influence, including making life much more difficult for projects like GrapheneOS. And I think it's only a matter of timer before they'll take more aggressive measures.
Btw, I am not saying one should or shouldn't use a Pixel with GrapheneOS.