The answer
No. EIP-7702 delegation is recorded in Ethereum account code state, so disconnecting a website session does not clear it. The account can reset delegation with a valid authorization pointing to the null address.
What to do next
Check the account’s code/delegate state with a trustworthy explorer or wallet tool and follow the wallet’s approved revocation process.
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Frequently asked questions
Can a regular Ethereum account keep its private key after delegation?
Yes. EIP-7702 leaves the original externally owned account key in control of authorizations.