Hi Björn,
No, SHIFT+H is not new (from before 2.8). There are many ways of Selecting, Deselecting, Hiding and so on….There will often be very handy shortcuts that don’t get mentioned, or even get forgotten. Everybody has their favorite shortcuts, that they use all the time.
I know SHIFT+H, but in practice, I rarely use it…I just don’t think about it…although it usually is easier/faster than Inverting the Selection and then Hide that.