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Ok, so you don't "need" to remove vCPU hot-add until the VM hits >=25 vCPUs but you should adjust to have all cores (<=24) in a single vSocket. AWE is used by applications to "skip" Window's virtual memory management and acquire ranges of locked (large) pages. While that size in configurable and sql server is opportunistic by nature, the large percentage of touched memory (vSphere "active" metric, _not_ the same as active in rammap / Windows where it means "resident") seems to support the claim of your DBA.
So yeah, unless the application / DB itself is inefficient, the VM really does need those resources.