I've never heard this, but, if it is true, I can see how it "didn't make the cut." It would have been just a little bit strange if Angel had shown up and said something like, "Just so you know, Buffy, I think that I might very well have been in love with Cordy, but she was possessed by an evil demon, and now she's dead. Now, let's kiss and talk about cookie dough, cookies, and Spike having a brand new soul."
But seriously, I doubt that anything like that would have fit in with the Buffy/Angel mini-reunion as it was portrayed in "Chosen."