I have no idea who you think you are arguing with here. There hasn't been a single person who disputes that carrying water BELOW the molten lead surface will cause a steam explosion. But just for the sake of 100% accuracy let me ask a clarifying question: is it your contention that water gently introduced to the TOP of the pot will cause a steam explosion?
Tell you what: the next time I cast I will shoot some video of myself dropping water onto the surface of the melt with a straw or a pipette if I can find one.
Video posted below: