Yes, with the commuter certificate mentioned upthread.

In my case it's moot anyway, because my work season has been postponed until at least April 27.

I work in the psychiatry. We cannot stay away from people.
The atmosphere is so tense even in our team... it's hard to go to work these days :(

I can imagine it's especially tough for you and your very important work.

Just a heads up - as Frankfurt is one of the gateway cities. The city of Frankfurt announced a mild curfew for all restaurants, pubs starting from October 09, 2020. Restaurants, cafes, pubs etc are obliged to close at 22:00 (10:00 pm). It is mandatory to wear face mask in the main shopping ares. The restrictions are in place till October 18, 2020.
Source and additional information on https://www.faz.net/aktuell/rhein-ma...-16988823.html

I have upated the WiKi with the latest information and some links regarding the lockdown light in Germany, which will start on November 02, 2020.

Feel free to add information, which you consider important or correct information, which is not correct.

In Rheinland-Pfalz the implementation on the ban of tourists is to close all hotels, AirBnB, camping, guest house. Tourist have to leave by Sunday midnight
https://corona.rlp.de/fileadmin/msag...2._CoBeLVO.pdf

In the Lander Hesse, which is where FRA is located, the directive to ban tourism is implemented by the closure of all hotels
https://www.fnp.de/hessen/live-ticke...-90084495.html

In Bayern hotels stay open but must not lodge tourists: https://www.bayern.de/bericht-aus-de...20/?seite=1579

I don't think it is necessary to complicate things by referring to the many miniscule different phasing in of things by various federal governments.

Fact is that lockdown restrictions are basically imposed nationally wef 02. November.

Yes there may be a few differences in implementing the fine tuning, but no need to miss the big picture - Germany is returning to lockdown on Monday

Not 100% correct. For example in RP hotels are closed but may open to accommodate people for non-tourist reasons. So same as in Bavaria.

Correct of course.
However there are people travelling in Germany who are not German residents and knowing that hotel are closed in some Lander is valuable to them.

In North Rhine Westphalia even as a tourist guest, you can stay in your hotel if you checked in prior to October 29, 2020.

How exactly are hotels in Munich policing this? Will I need to tell them at check-in what is my purpose in the city?

Do you want to test the system? I suspect hotels are required to ask for the purpose of your trip, and in Bavaria they take things a bit more seriously than elsewhere in Germany.

Yes hotels can ask but guests will answer whatever they want, which defeats the purpose of requiring hotels of asking - it's just pretending they are doing a job.

Granted it's not even remotely close to being the oddest thing that has happened since covid, but still not the most well thought out implementation in my humble opinion.

I've heard from collegues of hotels much stricter than this, requiring a letter from your company certifying you're traveling for work and such.

Yes, indeed, I have heard this too. I have also seen police cars outside several of the bigger hotels in Berlin. Now, this may be a coincidence, but it would not surprise me if they occasionally popped in to check on things.

The bottom line is that, if you are a single traveller with a trolley and a briefcase staying one night, with a letter from your employer and that of the company you are visiting, you'll not likely have any problems. If you show up at an Alpine resort with your two kids on a Friday afternoon, I think you may get more scrutiny.