That is not a position backed by our current climate science knowledge. We do have a certain amount of climate change baked in right now, absolutely. And it will remain like that for quite a long time, and yes, if we went net-zero, it will stay that way for many decades, maybe even a century or two.

But we can influence how bad that period is, and if it will ever level off (for future generations, not in our lifetime).

If we throw up our hands and do nothing, we are guaranteeing our doom as a species. If we continue to fight, we can ease the pain and horror we and our future generations will have to go through, survive as species, and far in the future, bring the climate back to what it was pre-industial revolution.