Passphrase creates a completely different wallet. You didn't state that they transfered funds so they are still on the first wallet.
Question to the community (trivia)
If a person has WALLET 1 with no passphrase but imports the seed phrase to a new WALLET 2 and decides to add a #passphrase during the process, where will the funds be?
A) WALLET 1
B) WALLET 2
C) Both
#CryptoSecurity #SeedPhrase #PassphraseProtection
nostr:npub132ertlsrunh600cph2au55ssmel2cqdt5mnrpxfand5ych4nmp8q50zmdh nostr:npub1a2cww4kn9wqte4ry70vyfwqyqvpswksna27rtxd8vty6c74era8sdcw83a 
Discussion
Based on your answer and the fact that you explain you reasoning ✅✅✅✅✅