He doesn't. People start off with that when they're scared of voicing their actual opinion and it softens whatever they have to say a touch.
Or it could be that they want to give people they don't know the benefit of the doubt. I don't really consider it a sign of good character to not do this and the vast majority of people would too. That you didn't even consider it...
Like a compliment sandwich or something.
I do. I'm familiar with his research from the pre-Google era, and that's that.