I was more than interested to note that Russell has offered an
apology for the misuse of 'post-digital'.
He coined the term as a way of considering a possible future where digital tech is so ubiquitous that it becomes invisible.
I coined the term culturally digital as a way of think about a possible future where digital tech has had such an effect on how we behave that it might be fair to say we're living in a digital culture.
They're both talking about the same, indefinable, vague, possible, potential future. Ish!
But 'post-digital' has been often used " to suggest that 'digital' is a solved problem or yesterday's fad". And occasionally 'digital culture' is used to describe the sort of things people like online, link funny cat videos.
But the sentiment of both is much bigger than that. And we're no where near a time when either phase can describe the current state of the world. That'll probably take a generation or so.