Avi, a short walk over to the geology department would have saved you the embarrassment of publishing this article. Some of the geological process you enumerate do destroy evidence, but some are very good at preserving it. Thousands of geologists over the last century have devoted themselves to the study of the Permian Extinction. Not a single one has found reason to claim discovery of traces of an advanced civilization. Yet there are many discoveries of far more delicate biological traces.

This hypothesis belongs in the trash can.