I too desperately want a sterilizing vaccine. Given the existence of influenza and the common cold (a bunch of rhino and corona viruses), this seems unlikely unfortunately.
If it seems unlikely, then someone should explain why it works in a mouse model but not in the real world. If the virus mutates too quickly for a full sterilizing vaccine, then nonetheless, any vaccine that reduces transmission is helpful. If the virus mutates too quickly period, all the more reason for variant-specific boosters, targeted to the strains circulating, just like the yearly flu shot.