Story just is that the most fans are not in the stadium but are the ones that watch either at home in Germany or from abroad. Even the most fans with season tickets (and there is long waiting lists at some clubs) watch the away matches via TV.
When I hear fan voices it usually is just the fans that attend the stadiums - not the many, many others. And no - it is not that this ones are the only real fans as they often say they are... They are just the ones that are lucky to be able to attend the matches in person.
People at home create revenue. (Non-plastic) Fans at stadiums create the atmosphere and culture that Bundesliga is trying to sell.
So there is definitely a difference.
But I don't think the protests are about that at all. They are mainly against selling out and I guess, if we're being honest, also against change in general.