Technology is, in the broadest sense, mind or intelligence or purpose blending with nature.
It's worth remembering that all technology leaves a footprint. For example, our own technology is leaving a footprint in terms of global warming, which could be detected from a long way away. One assumes that a very advanced civilization that has been around maybe millions and millions of years would have an even bigger footprint that might extend beyond its planet to its immediate astronomical environment.
To expect alien technology to be just a few decades ahead of ours is too incredible to be taken seriously.
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