The rules on sidelines pertain to players and nonplayers (coaches, substitutes, trainers, and “other team attendants”). So, basically team personnel. Media doesn’t fall into that category so they aren’t governed by these rules that could warrant a flag on the sideline.
However, as an official, we maintain jurisdiction of the field area, so in this scenario if a media member directly interferes with an official, I would likely have the interfering member relocated (either through direct conversation or by game administration if they aren’t compliant) to an area of the field where they can’t interfere through the remainder of the game. Usually this is a nonissue for officials if you have a good pre-snap routine each play of surveying your sideline. Almost everyone is compliant when you ask them to move back or relocate. Good sideline management by the official(s) avoids almost all of these issues.
Most officials understand media members are there to promote the game. It’s in our best interest to accommodate the media to keep HS football alive and well. We do our best to work with them for space on the field when we can. Not always the case, but usually.