In this modern time? Someone is still losing bitcoin through forgetting of password and seed phrase? That person is not serious and careless and I have not seen such unless hacked issues. He woul have tried to login with the password since so that would have known that problem. And if in case he changes mobile phone too, he can still access the Wallet. I discovered two things from the quote, "part/half of his bitcoin" meaning, it is not all the bitcoins were in one wallet, and secondly, "he didn't copied the seeds/password" what about the time he opened the Wallet? He must have copied it and misplaced it after using in to login and add the fingerprint.