This effort is a direct continuation of their Political TV archives which have over the last years become more and more important and popular. They catalog every political ad around elections, every speech given by every candidate, etc. As far as I can see, all they're saying here is that they've put the Trump videos into their own category, which seems reasonable given that he's an important figure and a lot of people are looking for this data.
I suspect they would have created a similar thing for Hillary if she'd won. Don't know if they did one for Obama, but as I said this part of the archive has been growing fast for the past years and gotten them a lot of visibility from mainstream news media that uses this data, so it's not surprising that they're using the election result to draw attention to their archive.