As with most pro-abortion arguments: That's irrelevant. That a human fetus shares the appearance of many other mammals at that age doesn't mean it's not a human being.
Were I in Kirk's shoes, I would say, "Fine. Let's grant your point for the sake of argument. It's not a human being at that stage. Is it a human being at this stage (17 weeks)?
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"If so, do you oppose aborting at that stage?"
I would wager, like many abortion proponents, that Gleib would still not oppose it. And that again would show the whole line of questioning to be a red herring: Abortion proponents generally are immoveable from their support of abortion
even if the fetus is a human being. Yet they continually engage in debates about the fetus' humanity. Either they're unsure of their position, or they're just dishonest.
It's possible I'm wrong, and that Gleib is a rare example - he would oppose abortion if he were convinced its target was a human being. If that's true then I'll give him credit for it.