You cant walk to a data center either

Mwah, that depends on what you consider walking distance. I remember walking back from a Rite-Aid in SF when attending an IETF conference, entering the conference hotel and being asked by other attendees 'where the hell I managed to find a Rite-Aid here'? Well, it may have been a 1.5 km walk but it was there, sure enough. I did not look it up beforehand, just started walking out of the centre and found one. Sure, if you only look in the local block you won't find one but then again if I walk 1.5 km from where I live I only find more trees so everything is relative.

The zoning for that lot would allow a grocery store. Not being able to walk to the grocery store isn’t a zoning issue in this case.

What? This depends entirely on where you are. And for far more people, I would expect they can far more easily walk to a grocery store than they can any sort of industrial thing.

I walk to the grocery store, and can't walk to a data center.

Whats really frustrating is how silicon valley fights tooth and nail to stop housing from being built in their community only to force these data centers onto everybody else's communities.

It all makes sense once you realise the purpose is to maximise the amount of car storage. You're allowed to build car storage in every zone. Many zones even have a minimum amount of car storage required to accompany anything else you want to build.