Absolutely this. I highly doubt Reddit would want to fuck this up at this point for seemingly minimal gain. Much more likely that a 10x increase in deletions caused some pipeline to collapse somewhere.
As much as I hate to give Reddit the benefit of the doubt, I think you’re right that Hanlon’s razor may well apply here, albeit substituting incompetence for stupidity.
I can see this starting a positive feedback loop of issues. More people get upset; so more people start deleting -- cascading failures start occurring. Hopefully their team can keep it under control.
But would the current upset userbase even believe reddit if they came out and said "our deletes arent working right now. please try again later."