Debbie Harry is a person. She is not called ‘Blondie’.
Blondie is a band.
So…
This is the earliest Blondie video I’ve seen. It features Debbie Harry and a rough-and-ready backup group. Not sure who that guitar player is, but he looks like he could have been The Heartbreakers.
… if this was Debby Harry with a rough-and-ready backup group then perhaps it is the earliest Debbie Harry video you’ve seen. Is there anything to confirm this was billed as a Blondie performance? (Other than the implied claim by whoever posted the YT video.)
Was there an incarnation of Blondie with different members before the band we all mostly knew?