See the release notes at https://pyoxidizer.readthedocs.io/en/stable/pyoxidizer_history.html#version-0-16-0
The Python wheels have a 0.16.2 version component because the initial build of the 0.16.0 and 0.16.1 macOS wheels was buggy due to the pyoxidizer file not being executable and therefore not being installed by pip. There were no functional changes between 0.16.0 and 0.16.2.