I read the the opinion. Its a disaster. “First, and most importantly, it is abundantly clear the Constitution does not guarantee that individuals may avoid taxation through inactivity” (Page 41) “The Federal Government does have the power to impose a tax on those without health insurance.” (Page 44)
By implication, Congress can pass a tax on people who earn nothing. At present, you can avoid paying income and Social Security taxes by "inactivity." According to Roberts, there's no Constitutional guarantee that economic inactivity means protection from taxes. So, Congress could pass a head tax and it would be Constiutional.
From that, it's only one small step to "discover" that the Constitution does not guarantee that taxes can only be paid in legal-tender money.
Congrats, Yer Honor. You just opened the door half-way to saying that forced labor is Constitutional if structured as a tax.