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The Pixel 4 got 3 years of service. I'm not sure that is out of Google's promise. But, it does seem to be short lived.
I think people were surprised Google did the work to upgrade it to Android 13 but only did a couple months of patches for it. I think the old promise was 2 years of major os and an additional year of patches.
Sounds believable because Google has built up a reputation of killing projects out of the blue.