I was actually just trying to find a fitting community to ask, but couldn’t find anything fitting. Was this just a simple editorial error, or is there something making the statement technically (virtually?) true?
UPDATE: Apparently, I was superficial enough to not take a closer look at the 1973 title. I never even heard of it (I don’t think it was on TV in my country), and I didn’t even consider the responsibility of it not being a standalone film. Thanks for solving the mystery, folks!
1973 would the year The Young and The Restless first aired, not when she appeared on the show.
In hindsight it looks pretty obvious - for some reason I didn’t even take a closer look at the imdb page of The Young and the Restless, and I had no idea it was a show. Thanks for the answer!