I don't think anyone is pretending that Go is a decades-old language. What is the standard term for this kind of inlining which would distinguish it from the inlining already present in the compiler?
There isn't a standard term, because virtually all inliners always did what Go is now doing. It's pretty basic functionality.
What does it include? You've conveniently managed to skip over the crucial part with ellipses. Calls in the middle of stacks perhaps?
You people have too much time on your hands to go and pick at the wording people use in their presentations.
What kind of argument is that?