It’s outright theft.
There is a video on the page - in which it is revealed this was a stock account which he had been paying taxes on.
They had not accessed this account for 6 months.
Many people do not access or make transactions on retirement or stock accounts.
I know a guy who worked a good job for years and never had a bank account. He owned the house his parents left to him and lived pretty simply and ended up with several hundred thousand dollars in a safe. He decided that it was too dangerous keeping it at home so he opened an account and deposited it.
He ended up regretting his decision within less than 8 hours when two FBI agents showed up at his door demanding answers and telling him that the money had been seized till they got answers.