So, theoretical attack relying on non-existing deployments to get a person's past position, even with several other ways of obtaining the same information (for example: cell tower tracing, collecting info from cameras, cctv, card purchases, etc)

Thanks I think I'll keep using the app

Our parents did not write that you shouldn't use some app.

There was a very specific claim about the Google/Apple approach and its usefulness for surveillance and someone objected by teasing a possible pathway for using proximity tracing for surveillance.

One can acknowledge an approaches inherent risks without making absolute judgements about the approach in general.