Would an advanced race actually do something so illogical?
By "advanced", I assume the summary meant "technologically advanced". How would any civilization reach a high level of technology without going through industrialization? It's not like anyone enjoys living downwind of a coal plant, but the messier forms of energy production are convenient, cheap, and don't require any advanced materials or science. Try to imagine an alternate history where we emerged from the industrial revolution with effective, sustainable fusion and solar power without ever polluting the planet.
The thing is, fossil fuels run out rather quickly on the cosmic scale. A few centuries and the consequences of pollution become apparent quickly too. A civilization must quickly move to something cleaner or it dies. Either way, the pollution stops. What are the odds that our telescopes will find a planet inhabited by a civilization that just happens to be going through a (likely) one-time few century window of time?
If they exist at all, the average of civilization out there is probably tens to hundreds of million years old. It is unthinkable that a civilization that old would still be producing significant pollution (at least of a type that we are familiar). Maybe we should be looking for efforts to dump excessive waste heat.