Why would they be?
However, keep in mind asset seizure relates to proceeds of crime, or involved in crime. So for example, Dennis Hasert - the money he took out of the bank in an illegal manner to pay someone could be seized, if it is determined a crime was being committed.
The question is whether paying someone to be quiet is a crime - if not, only the money pulled out in less-that-$10,000 increments is demonstrably part of a crime. Once the statute of limitations has expired, presumably it is no longer obstruction of justice to pay someone to shut up, since it does not actively block any prosecution. (IIRC the obstruction charge is for lying to police now, not for the crime way back when…)
However, the money still in the bank is his, and he earned it (allegedly) in a legal manner, so there is no reasonable grounds to seize it. Same for his home, car, etc.
The real threat with asset forfeiture is the original purpose of it - if the person is basically making his living mainly on a criminal enterprise, then he paid for his house and car from those funds and so those assets could be deemed “proceeds of crime”.
I’m not sure what happens, for example, if the person has a substantial non-criminal income, say a congressman who takes a bribe? Generally, I have not heard of the law going after the house or bank account because of this, unless they can trace the money going directly into buying the asset.
Also keep in mind that a lot of asset forfeitures in the news are about small amounts - less than $1,000. The cops pull over someone for DWB, take all their money, a few hundred. They don’t need evidence of a crime; it will cost the unlucky person far more to pay for a lawyer to get his money back, plus possible travel time.
Contrast that with a very high profile case, where the person is going to have to mount a major court fight anyway. He will have the lawyers to mount a fight, and the asset is probably worth fighting over, so unless the DA is sure he’ll win, it may not be worthwhile to try to take it.