This article (and the one on infowars) has a definite bias.

Watch the interview with the dude on this website, from after his arrest and before his sentencing:

https://www.kcci.com/article/man-charged-with-taking-burning-lgbtq-flag-found-guilty-of-multiple-crimes/29714879

"He told the people in the bar that he was going to burn the place to the ground":

https://www.kcci.com/article/im-guilty-as-charged-man-says-he-doesnt-regret-burning-church-lgbtq-banner-at-gentlemens-club/27982018

"The defendant stated that there was nothing the judge could to stop him from continuing this behavior and that he would continue to do this no matter what,"

https://www.kcci.com/article/adolfo-martinez-sentenced-for-setting-fire-to-church-lgbtq-flag/30281099

You're going to hate this link, but they HAVE gathered most of the significant details together in one place:

https://www.snopes.com/fact-check/iowa-man-16-years-lgbt-flag/