Yes, "It is likely that there is some reason for the number" implies a low Kolmogorov complexity. But it seems to me that if you look at past cases where we have already discovered the truth, you may find that there were cases where there were indeed reasons, and therefore low K-complexity. If so that would give you an inductive reason to suspect that this will continue to hold; this argument would not be circular. In other words, as I've said previously, in part we learn by induction which type of razor is suitable.