No, because those laws had always been in effect for Warren Jeffs. They were not imposed upon him after the fact.
“They were not imposed upon him after the fact.”
We are not talking ex post facto here.
We are talking about an activity which became illegal at some point in time and while those who were involved in polygamy prior to the law being passed were not in violation, those who committed polygamy after the law was enacted were in violation.
By your standard of “They (the polygamy laws) were not imposed upon him after the fact.” an abortionist could claim the same thing and continue to perform abortions after Roe v. Wade is overturned and a state passes a law to make performing abortion to be illegal..
The Abortion Law was passed after the fact that said person became an abortionist.