Android's extra Pixel 6 and Pixel 7 updates weren’t just because of Tensor
It’s down to the dev changes within Android

In December 2024, owners of older Pixel devices were greeted with a great surprise when the Pixel 6 and Pixel 7 received a lifespan extension. Both devices were set to get three years of guaranteed updates with the Pixel 6 entering its end of life, but Google extended that at the last minute to five years, giving it a lifeline for two more years. The Pixel 7 will last for an extra two years too, taking it through to 2027.