> how much time has elapsed between two releases
If they really wanted to communicate that clear without having to read extra docs they should have used 2019 version instead of 19.
> Our Spring ‘19
The world is big, bellow the line of the equator the seasons are opposite so that could lead to more confusion to the lower half of the planet.
In summary, whatever works for them, SemVer is not the clearly the winner in market share, so we as devs always have to check and double check when upgrading things but IMHO the arguments provided in the article are not strong enough to justify the move.