That’s what this article says.

And an exhibition in the Victoria & Albert Museum on postmodernism does sound like it has been relegated to history.

But if so, will I miss it a little?

Yes, I suppose. I was certainly born and raised during its apogee. Whatever follows or is already following will be something intrinsically more foreign to me than postmodernism was, even if postmodernism was itself intrinsically inexplicable.