There's nothing here to indicate that; not retroactive commentary at the end, nothing. If (s)he's trying to make a joke to make a point, (s)he's doing neither.
This is also under the assumption that the person in question isn't a sociopath.
> Voter registration is unfortunately a front for other malicious activities - such as jury duty, a state-mandated intrusion into my most private information and thoughts
How can you get to that point and not immediately understand that it's obviously satire?
By having encountered people who express exactly that sentiment and are deadly serious about it.
Which aspect of that statement do you find satirical?
Jury-duty forces someone to have an opinion on record about some contentious topic. By most accounts that is an intrusion into one's private information and thoughts.