You're assuming they're not skilled enough to do it without giving anything away.
FTR I'm not saying this is what happened. I don't think it is. But I do think it's a very real possibility and probably has happened in other cases.
They're at least 50 years ahead. If you look at something like the SR-71, we're talking about something Kelly Johnson developed almost 70 years ago. And we don't even really know what the next thing after the Blackbird was (assuming there's more than just drones and satellites, which I do assume). If their tech development has equalled or outpaced the PC boom of the last 20 years, we're probably talking about some Star Trek looking shit at this point.
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