Ridiculous by the virtue that you cannot plagiarize yourself, regardless of the venue. A speech is not a paper being submitted for review, where you would have to give acknowledgement to the original author of the statement being referenced.
“Ridiculous by the virtue that you cannot plagiarize yourself, regardless of the venue. “
Not entirely true.
In an academic setting for a research paper you provide a citation when you quote, use a fact or statistic.