I really don't see how it is seen as contradicting something that has never been seen on film, or confirmed. Besides, nothing has been changed. This is just another cycle added on. It's not a very efficient way to reproduce, but as long as it gets them to where they need to be for the Queen to fully develope, why is it a problem?
I remember reading many posts from members here that said they would have a problem if it was egg-morphing. It's to slow a process and so on. Now we have something NEWand now there problems with that. How can something new, unexplored, and never seen on film contradict anything. This new idea isn't discrediting the old. It's simply adding on, or evolving and adapting to survive.
I would think that once a queen reaches full maturity, this new idea would no longer be needed. It would once again start laying eggs. Facehuggers are a far more efficient to populate. In a different situation, the Alien may have a different method of reproducing. Aliens adapt well to their environment. Since this is the first time this timeline of the Aliens' life cycle has been explored in film, there are no rules being broken. No cannon being over written. This is establishing something new.