I just think it's part of the skepticism, that is very common in that generation of Americans, about U.S. foreign policy. They grew up hearing all these horror stories about U.S. meddling in foreign affairs, so there's been a re-evaluation of whether Russia is really that bad at all, or if they've just been painted as such by the "establishment". Russiagate didn't help in that regard, it was just a whole lot of hot air, and very little substance, played for views by mainstream media, making that skepticism grow, and also drove up the demand for this type of content that has parallels to the situation in the US.
It seems odd that he'd go that far to pursue the story but I've seen a lot of content creators going for these type of "let's hear it from the horse's mouth" interviews, instead of listening to the story through filtered channels. That, again, is another way in which these skeptical, anti-MSM and anti-establishment channels try to separate themselves from the pack, by giving you content that is "raw" and unedited, rather than having some "expert" explain it to you.
Where they end up failing, often times, is by trying to push their audience too heavily in one direction, to form a certain opinion about the events. I get that these guys need to sell their product and cultivate their audience, but sometimes it goes too far.