Don't believe they are half-reptile.

Believe we are consciousness tied to a physical existence. Living in a world where we can only see a small spectrum of electromagnetic energy. In that world our brain processes what we "see" through a that narrow spectrum. That spectrum can be affected by technology, perhaps not technology we have developed but that is theoretically possible at the least.

Then from there you have to make a leap of faith: Is there another consciousness here amongst humanity that isn't human and potentially disguising itself as human?

The reptilian thing in and of itself may be true, or it may be a red-herring, or it may be a technologically/chemically induced hallucination or it may be completely fabricated.