He says that the scene was never intended to be the way Lucas claims.
The problem here is he is talking about what Lucas intended as if he would know -more- about it than Lucas would.
Any way you slice it, we have two people with different takes about what "Lucas intended", and I defer to Lucas himself, because I think he has the best chance of knowing what he originally intended out of the two.
At the end of the day, I don't think there is any question that when it came to time and money to finish ANH, their backs were up against the wall.
If Kurtz is actually saying they could have done whatever they wanted, then he is alone in saying that.