If i was to speculate on why theyd be taking so long its probably because theyve got some byzantine bureaucracy nightmare going on where theres like 3 different departments who are based thousands of lightyears apart who all have to come to a consensus on what to do. Even if they have FTL communications somehow it isnt necessarily instant either so they may be spending all this time going around getting approval from all the relevant groups lol. Thats not even taking into account if they have laws about like what technology is allowed to be brought into a solar system like ours. If you wanted to not accidentally give humans some crazy ass tech then the best way to do that is to just make a law like "Only tech that is a maximum of 300 years more advanced than the local species may be brought into the solar system" or something like that.

If thats the case they may need to seek approval just to bring more high tech shit in so they can use it to disable the nukes. It would also explain why the things crash sometimes. no AGI allowed in our solar system so the poor Aliens have to actually pilot these relics of ships themselves. From our perspective they may look super advanced but from their perspective its a horse and buggy lmao.