RFK Jr has just been confirmed as HHS secretary so I'd postpone your medical exams until April (I think that's when they no longer require flu shot for exam) and wait for the covid-shot requirement to be removed from immigrant medicals. If the covid shot is not available anyway in your country, the local med doctor performing exam should give you blanket waiver on it.
Or you can go the I-601 waiver route but that's $$$ and time.
If she has a valid drivers license and unrestricted SSN card, that's all you need for employment purposes. EMPLOYEE not employer decides which documents to provide for I-9 form.
Says on their website they're processing limited number of immigrant and non-immigrant visas: https://iq.usembassy.gov/immigrant-visas/ Perhaps you'll be one of those cases.
If it's one of those forms that has translation of boxes in 15 different languages in the bottom of the page - we did not translate that. It was already called international marriage certificate.
So it's all on the immigration officer at POE - if you have pre-clearance in Germany, all the better. But best to be prepared - letter from the job, proof of return ticket, life in Germany.
If ban expired, then it will just be the wait time for I-130 processing and until his PD number becomes current. Hopefully there's a back up plan given his mother's age.
If you know the date is wrong, why would you even consider submitting it? Get it fixed (as it's obviously their error, you should call them up and have them expedite the processing) and then send everything in.