I'm not seeing this in the FAQs handed out by the Iowa High School Athletic Association yesterday. It specifically says that local entities and conferences will determine what levels to play. Some of this even may get looser with yesterday's announcement that youth sports can resume.
A7) Middle school softball and baseball are currently not allowed. Local and conference will make decisions on which levels at the high school will participate this summer. All current eligibility policies for 8th graders playing high school baseball continue to be in place.
I did a story on the return of baseball and softball for my web site, and our local softball and baseball coaches said they could work within the rules. Some may choose not to, and that's okay, according to the FAQs. They also specifically say there is no limit on roster size.
Are you looking at something different?