Dr. Craig is a liar.

[SteveII]

Is the importance of falsifiability really being questioned?

The problem is that the proposition "falsifiability is important" is not itself a falsifiable proposition.  The criterion of falsifiability is justified on philosophical grounds which, themselves, are not falsifiable.  It's a point about the self refuting nature of any propositions like "in order for a proposition to be considered true, it must be falsifiable."  Falsifiability itself fails this test.

That is the same logic used to defeat the claim that we should believe only propositions that can be verified by science. You can't prove that claim scientifically.