You’re not wrong, but jail time and justice is not what motivates HMRC, or any other revenue department. They want one thing, and one thing only: The money. Putting people in jail costs money, letting rich people 'fess up and pay up is much more lucrative.
Well, other than the fact that we don’t live in a perfect society (have you noticed yet?), because a rich, famous, influential 92 yo is probably the last person the authorities want in jail.