Apparently it is not legal for a federal case.
It literally wasn't. It was tried under Wisconsin jurisdiction. https://en.wikipedia.org/wiki/Kenosha_unrest_shooting#Ritten...
It's bad practice to give-in to the algorithm the way you are suggesting. Just as bad as only reading the headlines.
That page clearly states "Under Wisconsin state law, Rittenhouse was charged as an adult with the following crimes: ..."