The R6 is marketed as a mirrorless DSLR. Obviously the SLR part isn't accurate but the way you use the camera with interchangeable lenses is about the same. So for the user it's just a technology and feature upgrade more so than a new product.

The point he's making is about the sensor and the glass, not the mechanics of the camera body?

It’s essentially become a common term like Kleenex.

Mostly, yes, but not completely. A better generic term might be an ILC (interchangeable lens camera).

Most of the manufacturers are focused on mirrorless, but the DSLR market is still alive.

Pentax has bucked the trend and has continued to release new DSLRs as recently as this year.

ppl also use DSLR to refer to the body type