That's a load of bullsh!t, you would have mentioned that in your post if that was the case, you didn't because you knew you were in the same boat as the people you were calling out. You only acknowledged this after that account manager outed you with the chat transcripts.
And it doesn't matter if you only ran it for 6 weeks, you knew what you were doing was wrong and you did it anyways, doesn't matter if it was 6 weeks, 6 days, 6 hours, you knowingly circumvented the Adwords policies to get your ads listed where they shouldn't have been.
Your GPWA accreditations should be reviewed because you knowingly used malicious search engine techniques, which are clearly in violation of the terms set forth by the GPWA.
https://www.gpwa.org/portal_sites/portal_seal.asp