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How is a double spend by way of 51% assault attainable?

If a transaction is already mined in shall we say block A and has 2 confirmations, how can this transaction be spent once more?

My understanding is that for a transaction to be propagated to the community it should be verified by every node, one of many checks is to see if the referenced UTXOs have been spent.

So as to double spend the inputs referenced on this transaction included in block A every node would try to confirm it however would reject the transaction because the inputs have already been spent and so the double spend try would fail no matter if in case you have management of 51% of hashing energy.

So how is it that these double spends are attainable by remining block A on this case?

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