If a police officer is doing something illegal, you are not legally required to comply. Also, Germany in theory has pretty strict laws about what is considered

If a police officer is doing something illegal, you are not legally required to comply. Also, Germany in theory has pretty strict laws about what is considered an appropriate level of force (which is why you're considerably less likely to see a German police officer reach for their gun because even drawing the gun is considered a massive escalation and may require them to file paperwork later). The objection to the reporting isn't that they weren't injured, it's that the numbers are used to portray protestors as violent even when the injuries were the direct result of police violence. If I punch you in the face and break my hand, it's at least extremely misleading to report that as a fight in which both parties suffered injuries (mostly because "fight" implies you fought back).