He is talking about what most people do, MACRO evolution or one species becoming another. That doesn't happen. Micro evolution does happen and this was just observing that (finally).
This is a distinction without difference. I could go on a "micro" trip to the corner store or a "macro" trip to the other side of the world. All that changes is the timescales required. There are swathes of evidence for """macro""" evolution, but the timescales involved are tens of thousands or millions of years. Can't run a controlled experiment on that timescale.
That's a weird way of thinking about it. What actually happens is that one species splits into two, when two populations of the species are separated for long enough to make them incapable of interbreeding.
> another argument is shot down, they have to move the goalposts and change the definition of what they actually wanted
Actually, a version of that is good part of the (scientific) game. Of course you have to criticize the theory, the experiments etc. Only, it has to be done in good faith - to look for the truth, not to defend a position.
The difference between Newton and Bohr, and Freud and Marx (to go for classical examples), is subtle, not gross. There is an entire Science, a whole field, about that.