It is certainly a 5er version, the older ones had the freewheel inside of the front beltwheel - that doesn’t apply to the above shown - so it can’t be a 3 er version.
You are within all the limits - so it will be depend on your force and your riding style if you damage the rear hinge in a short time - or not 
Edit: Let’s say in different words; if you are a killer rider you will damage each frame - independent of EN compliance.