I don't know what car you have but for any Model 3 or Y the most you will get from a 22kw AC charger is 11kw. Most cars wont charge above 7kw. 22kw on board chargers are basically a relic of a pre DC charging era.
It is unlikely that this proposed installation will support continuous 22kW at all stalls simultaneously. If Tesla is using their own equipment, it costs them nothing to make them 22kW max with power sharing between groups of stalls rather than artificially limiting them to a lower rating. Also, if you want to support single-phase 7kW (the most common in the UK) you need to supply 32A and if you also support 3-phase (to allow Model 3 etc to get 11kW), then the combination gives a notional 22kW even if no car ever uses it that way.