I work in construction, - data centres included - in Australia.

From my experience you’re mostly right, however it’s more like, in order of priority: power availability, water availability, data availability, land price. Cost to upgrade upstream power transmission dwarfs all other costs.

I’d note that after construction ongoing jobs are minimal. Specific example: $2B aud datacentre will support 30-60 jobs after completion. And probably 50% of those are low skill/income security,cleaning maintenance etc.