Hm this one is tricky , imho the transportation hub itself might be eligible, but the direction sign can be considered just street infrastructure (i am guessing there are many of this so its not considered distinct). I think the mall will have plenty of other thing to submit
Since your appeal got rejected, the normal procedure if you still think its eligible is to resubmit. You can wait several days if you want but honestly, i think you need to pass on this one
I am moving this from wayspot appeal because this section is reserved for edit appeal rejection and appealing wayspot removal