If our fossil record isn't thorough enough to find them then that possibility seems hard to disprove. Maybe some civilization arose, got stuck in the bronze age or early industrial tech for a thousand years, didn't generate those signatures, then died out. We might need to look for other markers like climate variances, radioactive materials or artifacts on the moon. But they think if there was we wouldn't find its fossils. The authors of the Silurian hypothesis paper believe it's unlikely that there was an ancient non-human industrialized civilization. (Not to mention that our archaeology is concentrated on places where humans lived which have little correlation to whatever might have been a good site for a dino city 100 million years ago.) If you imagine a dinosaur civilization that's industralized for 1,000 years before it kills itself off, they still hung on 5 times longer than we have so far and yet we probably wouldn't have found fossils of their wrenches.
Humans have only been industrialized for around 200 years. The dinosaurs were around for a long time, from 65-250 million years ago.
For example we've only found about one dinosaur fossil per 10,000 years of dinosaur history. I think the argument goes that if the civilization was sufficiently old and short-lived, no we probably wouldn't find any fossilized evidence.
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