The highest level of spoofing will make reviews stick. If your review drops, you know it's not spoofed. It only appears to be spoofed.
I actually agree with your point — if reviews don’t stick, the spoofing isn’t good enough.
That said, you might not be familiar with Ivanovation. It doesn’t spoof in the usual sense — it replaces the entire system identity at the root level.
All fingerprints change: hardware, OS-level IDs, and all browser layers (no matter what browser you use). Nothing is left to spoof — everything is fully native.
That’s why Gmail flows without SMS and why I’m confident GBP reviews will stick. Not detectable on pixelscan, fingerprint.com, or even deep JS tests.