Post-digital is that state where the digital is assumed, not wondered at.
I remember getting access to the internet in the early 90s in a rural community, and this whole new world of communication and ideas suddenly became available. I lived through the tragedy that was Geocities and Angelfire (etc) shutting up shop, the slow dying of newgroups and the rise of Myspace, Facebook and Twitter. Generations of digital entities living and dying.
I guess I am not post-digital. I still call it digital. I don’t think IRL is better than online, but I do differentiate between the two.