The TVL you see on the Superform App comes directly from the listed contract address.
Some ERC-4626 vaults listed on Superform are adapters, so the TVL shown on the App might be less than the total TVL for the given vault.
For example, the Morpho Protocol's primary contract for their ETH-AaveV3-Optimizer has ~$700m TVL (Dec '23). Their ERC-4626 adapter, which routes the funds to the primary contract, only has 2 total deposits in it. Both are published by the Morpho team, but are just different ways of accessing the same yield.