Not to go after "the rich." But to go after anyone -- rich or middle class - who the Deep States wants destroyed.
The oligarchs are safe from the IRS. They control the IRS. But any billionaire who leaves the reservation -- Musk, Trump -- is courting trouble.
It would be interesting to see the background experience of the armed IRS invasion team members. I will bet there are some seriously inferior people itching to use deadly force.