What's with the assumption here that there aren't humans involved in this decision? The linked post literally quotes Google saying:
"Hi Sun Knudsen, Our team has reviewed your content, and, unfortunately, we think it violates our harmful and dangerous policy."
Google has always had humans in the loop. Not for every decision but certainly the more impactful ones that affect user generated content. When I worked there, there were even humans reviewing requests for account un-suspensions (yes, really! they didn't do a great job though, needless to say).
Also, it's quite hard to understand what sort of algorithm could result in this sort of suspension. What training data would give it hundreds of thousands of examples of infosec discussions labelled as harmful? But it's very easy to see how a large army of low paid humans given vague advice like "don't allow harmful or dangerous content" could decide that linking to hacking information is harmful.
The problem here is not AI. The problem here is Google allowing vague and low quality thinking amongst the ranks of its management, who have decided to give in to political activists who are determined to describe anything they're ideologically opposed to as "harmful", "dangerous", "unsafe" etc. When management give in to those radicals and tell their human and AI moderators to suspend "harmful" content, they inevitably end up capturing all kinds of stuff that isn't political in nature, simply due to the doublespeak nature of the original rules.