Linux name.fritz.box 6.5.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Mar 12 10:22:43 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
The kernel is a 64bit version. Why are you trying to install a 32bit version package? If it is a mixed architecture system you can try to add arch=amd64 as option to the line in the sources.list e.g.:
deb [arch=amd64 signed-by=/usr/local/share/keyrings/josm-apt.gpg] https://josm.openstreetmap.de/apt jammy universe
Overall, this looks like a Ubuntu bug but we might just add the option to our instructions.
@team: Which architectures are we supporting with our Ubuntu packages?