Talking about how old humans are compared to the universe, I think a random poster on the internet put it best. "If we assume that the universe is about 13.7 billion years old and modern humans exist for 200.000 years, that makes approximately 0.00146 percent. Rescaled to a day this would come to approximately 1.26 seconds."
Even with our understanding of space travel, the whole universe could be colonized in a few million years. If these aliens had something akin to Star Trek style interstellar technology, they could do it a lot faster. For your proposition to be true, we would have to be living in this insanely small window of time between the aliens colonizing everything and their technology being invented.
That would be like if you had two people each with a stop watch, and you told both of them to start their watches at a random time during the day, and by total coincidence they happened to start their watches within ~3 seconds of each other. It could theoretically happen, but there's probably less absurd things that you would laugh at for their absurdity. It's probably more likely that Donald Trump is actually a super genius playing 5D Chess than your proposition being true.