Oh, yes, Apple is absolutely right. I hadn't thought of that, and the grammar references are silent on that point.
This pattern occurs with reflexive pronouns and the verbs hear, understand, and know. Examples:
Fred, being from Boston, had a hard time making himself understood when he moved to Alabama
Any candidate for public office must make him/herself known to a wide spectrum of voters
It means "cause (oneself) to be -ed."
Many thanks to Apple for this very astute observation.