Ofcourse it can, you can pull carbon directly out of the atmosphere and have negative emissions. Energy consumption of sequestation coupled with carbon footprint of solar/wind/nuclear works out to be nagative.

The IPCC stipulates negative emissions in the second half of the century.

Lastly, our carbon budget is not zero, if everyone kept to carbon budget of 3 tons of CO2 per person we'd never have climate change to begin with.

Isn't rest offsets? Like they helping cut emission from non Google things and using that to offset what they can't eliminate from their own emissions.

It still reduces emissions on the whole.