Prop surfing is normally against the rules on our trouble in terrorist town server. I believe it was the map creators intention for people to prop surf. There are two separate areas on the map where he put the two props next to each other. The props do not make much sense together as props, so he must have wanted us to prop surf. There is even a hidden area you can get to by prop surfing. You could make the argument that it would delay rounds since you might not be able to shoot the people in the secret area, but a single discombob will without a doubt kill anyone who is up there. It is also very dangerous to prop surf so the person attempting to do it might die. They are risking their round by doing this.
Prop Surfing Items #1
Prop Surfing Items #2