I am getting similar errors:
ITMS-90338: Non-public API usage - The app references non-public selectors in MedTextiOS: checkFocusGroupTreeForEnvironment:, commissioningComplete:, connectionTypesMask, pairDevice:address:port:discriminator:setupPINCode:error:, setConnectionTypesMask:, setListenPort:, sharedController, sleep:, test:, toggle:. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed.
Minor change in our code, successful submission 10 days ago, and now this. Very frustrated with such an approach from Apple.