I think GP might mean that as offense is completely subjective, it's better to let people define "hate speech" etc for themselves rather than having an agenda being pushed by a government or corporate entity.
That's your interpretation of what the workshop actually is. Read what I quoted again, it focuses on the technical side of things: how to flag, how to moderate comments, and how to deal with hate speech. Talking about an issues doesn't immediately mean you're pushing an agenda. The only one assuming people can't think for themselves is you.
Quite the opposite he is proposing people decide for themselves absent any "workshops". You are the one who thinks that people will benefit from Googles instruction on how to decide what is hate speech, frankly I think anyone should be able to say anything. If you decide that its hateful content then you can stop reading it at that point.