Answer:
Hi!
The answer you are looking for would be that the meeting is ironic because Faustus once declared that he will rule Germany.
Step-by-step explanation:
Faustus once declared that he would rule Germany one day, and the irony lies in the fact that he is meeting with the person who is actually governing Germany and has managed to take control over the entire country when Faustus hasn't been able to do that himself, even when he declared he would.