Large holders and kidnappnig

I saw a post about a kidnapping where the person was tortured and a wealthy crypto relative was asked for a ransom. I'm sure there's something I'm missing regarding security on the public ledger, but could someone explain it to me? I know there are seed phrases etc, but could someone explain why the following scenario would be unlikely to happen:

Tom is very poor and struggles to feed his starving family. Every month he pays the rent owed to his landlord in bitcoin. One day Tom meets his landlord and sees that he is clearly very wealthy. Tom realises the bitcoin ledger is public. He goes home and finds the wallet he pays his rent into every month, and figures out that ultimately, this money leads to landlords bitcoin wallet. He follows the publicly available information on the blockchain and finds a large holding of bitcoin that he is able to deduce belongs to his landlord. What is to stop Tom selling this information to some shady kidnappers who can then torture the seed phrase out of him and steal all his money?

Thanks in advance!