The example quoted is exactly the sort of thing that's not going on.
And where's the threshold for calling people bilingual? If you say "get down from the car," you're (likely) using that phrase only to people outside your environment. It's lack of fluency.
> “Thanks God,” a type of loan translation from “gracias a Dios,” is common in Miami. In this case, speakers analogize the “s” sound at the end of “gracias” and apply it to the English form.
That's just an assumption of the "mmm, let me think 2 seconds" kind.
The writer also calls it Spanish, but e.g. beef is "ternera" in Spanish. It might be Cuban Spanish, which has a fairly large vocabulary that differs from other Spanish variants.