Deutsche Bahn's FAQ on the Deutschlandticket states:
Can I use an ICE/IC train with the Deutschland-Ticket if I know I will reach the destination with a considerable delay?
Yes, you have the right to do so according to statutory passenger rights if the local train has an expected delay of at least 20 minutes. To travel by long-distance train, you must first buy a ticket. The travel costs will then be reimbursed subsequently upon request by the railway company with which you travel, e.g. by the passenger rights service centre of Deutsche Bahn.
As I've had the chance to find out, in case of normal, single-journey ticket, any passenger rights in case of delay apply to the delay as calculated across the whole connection. But it stands to reason that this is might be because the exact itinerary is specified on the booked ticket.
So, I'd like to ask, does the right to reimbursement of the ICE/IC ticket include delays in journeys made with multiple changes, or only across distances covered by a single regional train?
For example, suppose I wanted to use the Deutschlandticket to travel from Hengelo (in the Netherlands), to Zgorzelec (in Poland). The Deutsche Bahn journey planner, set to "local transport only", suggests the following itinerary:
Hengelo – Zgorzelec, Journey on Tue 7. Nov 2023
08:34 Hengelo – 10:27 Herford (RB 61)
-> 6 min transfer
10:33 Herford – 12:41 Braunschweig Hbf (WFB RE70)
-> 39 min transfer
13:20 Braunschweig Hbf – 14:29 Magdeburg Hbf (RB 40)
-> 6 min transfer
14:35 Magdeburg Hbf – 15:41 Halle(Saale)Hbf (RE 30)
-> 10 min transfer
15:51 Halle(Saale)Hbf – 16:28 Leipzig Hbf (tief) (S 3)
-> 32 min transfer
17:00 Leipzig Hbf – 18:24 Dresden-Neustadt (RE 50)
-> 11 min transfer
18:35 Dresden-Neustadt – 19:54 Zgorzelec (TLX RE1)
Now, suppose the RB 61 gets delayed by 10 minutes, making me miss the transfer in Herford. The next regional train connection out of Herford would have me arrive in Zgorzelec at 21:55, resulting in a delay of 121 minutes.
In that case, I could buy a ticket for a connection involving IC 2441, ICE 847, RE 2, RB 65, and a Koleje Dolnośląskie train from Görlitz to Zgorzelec, that would get me there at 17:43 – a whole 2 hours and 11 minutes earlier. Would the statutory passenger rights entitle me to reimbursement of this ticket?