Uninstalled apps using cellular data in iOS

iPhone X, iOS V 13.1.2

Let me start by saying that I have read the previous threads on this subject, and unless I'm missing something, the issue has not been fully resolved. The overwhelming push back from the community is that iOS is NOT using cellular data, rather, what we are seeing is a sum total of cellular data the apps used before we uninstalled them. Fair enough. However, there is a simple way to figure out if this is true.

I had some time on my hands and conducted a test. Here's what I found:

1) I reset the statistics for the current period on 10/2 at 3:30. The "Uninstalled apps" line is clear of any usage.

2) Without unloading any apps, at 3:31 the uninstalled apps usage shows 1.2KB

**The following times and usage reflect this statement:

"I have not unloaded any apps on this phone since I reset it at 3:30 on 10/2:"

3) 3:44 (7.1KB)

4) 3:49 (9.1KB)

5) 3:54 (13.2KB)

6) 3:55 shut off "Cellular Data" at the top of the screen and reset statistics (shows no data for uninstalled apps; also shut off all cellular data for each individual app)

7) 3:59 (0KB) no data leakage

8) Put on "Cellular Data" and added Safari - uninstalled apps 4:02 (10.3KB)

9) 4:03 (13.3KB)

10) Next day, 10/3 at 3:59 (297KB)

The only thing that seems to stop data leakage is shutting off Cellular Data for all systems.

So, if the answer to the question regarding uninstalled apps is that I'm deleting apps and there is a running total of data that the apps were using, why is it there is a constant trickle of data loss when I am reset the stats and don't delete apps? Of course, the larger question is 'what information is being sent (clearly, iOS is logging data to somewhere), and to whom is it being sent?'