War der Bahnsteig zwischen Gleis 13-11 jemals im Betrieb von Bahnhof lehrte?

Yeah, sure. Nothing was built without wanting to use it. Until 2019, passenger trains with the conversion and the “reconstruction” for S-Bahn and Regio/Nahverkehr were also regularly used by the track 12, which has no connection towards Celle. Track 12 has since been used as a transit track and thus for freight trains.

Read more on Wikidedia, Track division at the railway station Lehrte.