When you upload an IPA file to iTunes Connect and select either Testflight Tests or an App Version, some questions are asked. For Purple DS Apps these are to be answered as follows:
1st Question: Using encryption
2nd Question: Using Ad-ID (IDFA)
Answer 1: Yes
Answer 2: Only for advertisement
Background to Ad ID (IDFA):
Purple DS apps use the Advertising Identifier " ID ID (IDFA)" not actively. There will be no request at any point. When iTunes / Apple scans the IPS file, it looks like it is a source code commentary of one used SDK. So the result is a false-positive. The " Ad ID (IDFA)" is only used for advertising purposes.