Strange build number on Alcatel phone
That site you have linked to explains the build number of Android Open Source project (AOSP). AOSP is the base of all Android versions, however (except for the Google Pixel devices) AOSP is not used directly on Android phones. Instead each manufacturer adapts AOSP to each device and additionally usually a lot of manufacturer specific modifications are applied.
Therefore most Android builds you can find on real phones don't follow the build number scheme proposed by Google in AOSP.
As long as the built Android OS in the end passes the Google Android compatibility test it can be sold as Android phone with pre installed Google Android Apps (especially Play store).