Sirius Traffic, if enabled, is shown on the "normal" map as well as the Google Earth map and has nothing to do with the Internet connection speed. The first year I was on AT&T also with Sirius Traffic enabled and 2G data for Google Earth. An now with t-mobile, with much worse coverage than AT&T, Sirius Traffic works just fine where available and without a working internet connection. Over the years I found that Google Traffic / Waze or even Apple Maps traffic is more accurate than Sirius though, so getting a CarPlay upgrade would be a nice to have.

Those comments are just plain wrong. As others have stated, traffic condition red/yellow/green overlays will display fine on the standard map (with a Sirius traffic subscription). The Google Earth map overlay also displays the traffic but is optional with Audi Connect but not required.

Thanks again. Glad to have some clarification on all of this. I totally agree that Waze is an excellent choice for navigation. The "Police officer ahead" alert has saved me more than once. Car Play would indeed be amazing.

Can't remember if I've read any other post on this situation:
I canceled my Sirius subscription after the trial period. But every once in a while (maybe every month or two), the traffic display on the Nav and half of the Sirius channels show up for around a week. As if Sirius was trying to entice me to come back. (But I haven't seen a need to resubscribe yet.) Anybody else have this happen?

There have been reports that Sirus would enable traffic or radio for a few days or a weekend once in a while even without subscription. Doesn't last long usually though.

Funny, since posting this - I started getting Traffic Updates. It's a new to me CPO, so I don't know if the dealer threw in a few months of regular Satellite Radio, but that also works.. haven't subscribed to either.

It's possible that the prev owner didn't cancel his Sirius subscriptions. If so, when they end, the services will stop (the renewal notice will go to the orig owner). If at that time you decide you want radio and traffic to continue, you will have to call Sirius and establish your own accts.

When I purchased my 2-year-old CPO, I was given a 3-mo trial of Sirius radio and traffic. Didn't ask for it, so I don't know if the dealer arranged it or not. I didn't even notice it til 3 weeks in. Previous owner traded up, so their Sirius account went with them.

Those 2+ months were enough to convince me that other sources of traffic info were more accurate/reliable...

Paying for TMC is one of the biggest rip-offs of all subscriptions. The reporting is by far the worst of any service available and in reality is completely bogus information.
At any time of day, compare your TMC with Google (or anyone) and they will be drastically different.
Sirius and Audi should be embarrassed, I would not use this information even if they paid me $4/mo to have it.

No worries; there's no chance they will be paying you to use it.