That Maharal is terribly misrepresented. He writes that even if the nations are being so harsh that it is forcing you to leave the Galus, you still shouldn’t. This statement of his was played around with and said over as even if the nations want you to go Eretz Yisroel and they are forcing you under pain of death, you should not listen to them and rather die.
Rabbi Hartman, in his edition has another big Kasha. Just like Yibum is in the place of what would otherwise be Assur, it doesn’t make it more Chamur. Here too, although we are to stay in Galus even while it is dangerous, it doesn’t make it one of the three cardinal sins.