I am not sure I understand.
you reached out to armstrong and they said they will take care of you.
but you read online that they don't? so you are concerned about what?

I have not had flooring done, but brick work from acme and they handled the replacement, nothing out of my pocket at all. just had to pick the brick that was closest, since they didn't make the brick I used before.
I would expect this to be similar.
have you verified?