I've taken it as a lampooning of documentary makers/presenters. Especially history ones. There's a definite vibe of "aren't I all fancy and knowledgeable?!" about many UK docs in recent years. The whole Brush Strokes/Technotronic thing is a jab at them trying to look cool & with the times, but missing by a mile, because they're history or science nerds! Having a dipstick presenter here adds a comedic counter to the fancy/highbrow presenters of real docs.