I think it goes further back than that. You can find early radio broadcasts where the story was brought to you buy some brand. They would even work the brands into the stories sometimes.
G'day, mate? (I've never heard the term "soapies". Is it Australian slang? Having lived a decade in Hong Kong, I got exposure to a fair amount of Australian slang, and this fits the character.)
I've found that quite a lot of South African slang is mistaken for Australian slang, while a South African accent is often mistaken for a British one[1].
[1] I've actually been asked, once, "You're English, right?", when I was in the states.
> The term "soap opera" originated from radio dramas originally being sponsored by soap manufacturers.
https://en.m.wikipedia.org/wiki/Soap_opera