A more nuanced approach might work there. Some people are up at night because their projects keep them engaged, and delivering pizza to those people is not a bullshit job. What Graeber alludes to is when people have pizza delivered because they need to work their own bullshit job and thus do not have time to cook.

In other words: If there were less bullshit jobs, there would be less pizza delivery. Hence, to a certain extent, pizza delivery is also a bullshit job.

I'm not sure I subscribe to this reasoning, but I think this is a more honest representation of Graeber's argument.