That's assuming the impact of this change only applies to the raw CO2 transfer. But there's material research which can apply in other places, there's pressure on other known companies, etc. Even if it's a marketing push, the fact that people may see that some companies try to reduce reliance on wasteful production and start looking at other products they buy is a positive thing.

We probably can't predict right now if Lego can have a bigger impact on the world by trying to offset the current emission from other companies, or by being public about adjusting their prices. Pure production numbers give us only part of the answer.