That is just saying that they will be giving some donations to the project. I have zero insight into W4 or the Godot Foundation, but they may have already donated. They don't claim to be the sole financial contributor to the project.
Looks like they do donate: https://fund.godotengine.org/ (W4 games is an icon there as "Platinum Sponsor"). It doesn't say how much but given the amounts in the lower tiers it's probably not entirely insignificant.
So they _are_ actually using their $8M seed fund to fund Godot.
I do wonder if the author of the original post did their research properly. W4 games doesn't need to donate but they do so anyway.
