That's because he can draw with intricate detail when he chooses to, if the joke calls for it:
https://pbfcomics.com/comics/atlantis/
He even adds a ton of detail/shading to simple shapes to give it a more realistic look:
https://pbfcomics.com/comics/preserves/
https://pbfcomics.com/comics/shocked/
Or he sometimes juxtaposes simple facial expressions on more detailed drawings:
https://pbfcomics.com/comics/obscenery/
And it's pretty great when he just adopts another art style:
https://pbfcomics.com/comics/executive_decision/
https://pbfcomics.com/comics/punch-bout/
https://pbfcomics.com/comics/prank-dragon/
He's legitimately a great artist.
Yeah, anyone who has biked in city streets will tell you that the buses are much wider than even the big SUVs.