If you're referring to "If the main signal is a (train station's) exit signal ("Ausfahrsignal"), this speed limit applies until the last set of points/switch has been passed by the complete train, after which regular speed is permitted.", I think that means "once you see a normally working signal again, if it's of a specific type (the exit signal), you still have to stay at 40 km/h until you have passed all switches.". As far as I understand the article, Zs1 is mostly intended for very local speed reductions, the kind of speed caution relevant to this discussion sounds more like the Zs7 signal.