Yes. Frisk had told me about it already, in an attempt to appease me. Their manipulation of the timeline and their creation of multiples of them.

I found it somewhat difficult to believe, but. I suppose that your story is proof enough that it was true.

[Honestly, it's still pretty hard to believe. The barrier falling and nobody knowing why... Frisk helping... It sounds just a bit made up. But she supposes Alphys has no reason to lie.]