There's no reason that charger shouldn't work. Any USB charger from the beginning of time will work on the phone although obviously it may take days to charge on the original low current ones.
If it's not working then it's not Google's fault.
If not Google's then who's fault is that theirs is the only device which wont charge from the multiple USB C chargers we already have in the house? I've used that particular charger on a p20 pro, p30 pro, anker earbuds, steelseries headset, dualsense controller, quest 2, Nintendo switch, and the pixel is the only one it doesnt work with. The only one which actually works on it is the quest 2 charger, so its clearly extremely fussy about what it charges on. Which is fine, but if that IS the case then the environmentally friendly argument is nonsense, because it wont necessarily work on your old charger