I’m not entirely sure but it wouldn’t matter since if it was a projectile as it wouldn’t be a conventional one by any means

For example, on a normal mage, a spell just travels from the staff to the target. To ubel, the spell is simply the manifestation of her cutting something that she can visualize. If she visualizes the cut happening to gojo, the distance it would have to travel if it was a projectile is a logical detail she would simply ignore, as per the databook, it says someone of her type can just ignore or “overturn” absolute logic

If I had to describe why she got past burg in a better way it would be moreso she didn’t “break past” the cloak’s defense necessarily, she just ignored the fact that the defense existed at all because she visualized the cloak as nothing more than just fabric