namely was AfD "verboten"?
No. My response was to the question as to why there are no talks about banning the Left party as well.
Whether or not the AfD will be banned is up to the Constitutional Court. That Court has set a precedent that for a party to be banned, it not only needs to work against the constitution, but also have the size to realistically realize those ambitions in the future.
That is why banning the Neonazi party NPD failed, they were simply not big enough to pose a threat, even though they spelt out their program very clearly (which included btw regaining the former Eastern territories from Poland).