LOL! Great salesguy, there.
Yeah. Ice doesn't just "slide off". Ditto wind-driven snow. Or, just a heavy Frost.
I'm from Maine, and have a little exerience in such things. (/s) Or, if my word isn't good enough, they could just take a look at their car in the driveway on a wintry morning. :-)
‘Slide off’??? Guess they aren’t familiar with rooftop ‘ice dams’...idiots.
Maybe they will incude an ice excluder spray with every panel sold. Probably a re-labeled can of “Pam” cooking spray. Sneaky rascals.