Well it was dubbed with the new title after the initial release, I am not sure how that would indicate wether or not Lucas had thought about dubbing it that for the initial release.

According to him, he was thinking of doing that, but then they decided not to in case they didn't get to make it's sequels. Then as soon as it hit big, the first thing they decided was to implement the numbering system for ANH and it's now eventual sequels.

I personally am not convinced either way either. I admit there is a chance Lucas could be lying about this. My point is there really isn't anything to prove he is lying, so I give him the benefit of the doubt and refuse to accuse him of lying in this instance.