There are two possible readings of this.

a) we made banks cancel the accounts of those we didn't like, and as a result, they shifted to methods we could no longer see. Own goal. Let's change that so we can still see it." (I wonder what these "other methods" were that the German government was too dim to chainalyze.)

b) because the banks were making these decisions themselves when "suspicious transactions" came up, many of our their shady accounts got caught up in the bans, and it's really a pain to go back to the bank and tell them that "no, this one has to stay open, that one goes to the coke gnome in Kiev, that other one, that's our secret party financing, and that third one, welll let's just say it involves big boats"