In a long interview DeBoer uses "sort of" as conversational hedge / filler more times that I can count. He is otherwise articulate, never at a loss for words, confident of his opinions. The hedge doesn't really hedge anything, since its distribution seems random; it doesn't fill time, since it is spoken very rapidly and if taken out would not reduce the duration of the utterance in any significant way. He doesn't seem nervous, so that's not the explanation. He has a few more "uh..." "right?" but they aren't intrusive like the omnipresent "sortofs."
It must be very hard to get rid of a verbal tic like that. My students, when speaking Spanish, put in the word like (in English!) constantly, without even any awareness that they are doing it.