I get your point and I know that this roof is accessible per-se - however, Alex also already ruled on this roof, that its taking way to long time to access this roof without any abuses. And thats exactly what youre doing. Youre in an event, you try to get up quick and for that you use Aiming which is bug-abusing. I also tried this spots with 2 other admins and the fail-rate of jumping-over without aiming is just way to high. You aim at a specific spot to avoid this, so you abuse it - thats it.
I approved it because of this answer from Alex:
I took ban for bug abuse, because I climbed a roof to aim with the gun. But I have evidence that you can climb without aiming.
gta5grand.com
Since I understand that you didnt meant it in a too harmful way, I tried to be nice and just gave you a very low punishment on the ban-scale. Im looking forward how the higher ups rule on this.