Note that Adams is using persuasion tactics in the interview itself. The most obvious trick is that he describes himself as being objective (he doesn't care about Trump vs Clinton) and altruistic (because he's wealthy and older), making it more likely for us to believe the other things he has to say.
My guess is that Adams is hoping that Trump wins the election, because he will then write a book about persuasion and how Trump's persuasion skills helped him win. He already has a lot of this material on his blog. In that scenario he can capitalize on his correct prediction, which seemed radical at the time, to generate a lot of publicity for the book. Persuasion is a topic of perennial interest, and Adams is a skilled expositor. So there's a good chance that a Trump win will mean a multi-million dollar payoff for Adams.
I actually like Adams and think he's a smart guy, but I doubt he's much more altruistic and objective than everyone else. ;-)
I agree with your first paragraph, but Adams has described how his Trump writing has decimated his ability to earn money as a public speaker because people who hire such speakers want to avoid controversy. Adams appearing on the podcast of an obscure college professor was an act of altruism.
In the second half of the interview we discussed several topics of importance to the LW community including cryonics, unfriendly AI, and eliminating mosquitoes.
https://soundcloud.com/user-519115521/scott-adams-dilbert-interview