That’s a strawman. The argument is “would a devops person focused primarily on deployment be significantly less likely to make errors of this nature?”
When I look at our development, devops and operations people, the likely hood of making stupid mistakes seems to be correlated to skill-level rather than what title the person has. The developers who work part time with operations seems to cause less problems than pure operations-people, maybe because they only do it part time and therefore are a bit more careful.
But I'm sure you can enlighten me with some actual research-based facts?