While our time has been short on geological scales, that's a point in favor of being discovered later. So much has been deposited by us in the geological record

While our time has been short on geological scales, that's a point in favor of being discovered later. So much has been deposited by us in the geological record in a stunningly short (by future geologists' viewpoint) timescale like plastics, temperature variations, and irradiated patches of land. To make things worse for a hypothetical advanced dinosaur species, if they were at the point they could capture an asteroid, they would be roughly equivalent or better with us but we could survive an asteroid extinction event just fine. Society as we know it perhaps wouldn't survive but an event that could genuinely end us as a species would need to be exceedingly destructive or long term. Otherwise the remnants will rebuild, give or take a couple 10s of thousands of years, which is basically nothing on the timescales we're thinking about here.