Incorrect. Calculators produce their results by logical relationships hard wired directly into their circuitry. Basically, it's a series of voltage gates that physically play out the AND/OR/NAND/NOR/etc logical processes. There's nothing "random" about it; it's essential a conversion from one data type (binary/boolean) to a more easily readable one (base ten decimal).
I know how computers and bitwise math works, and yet none of that explains where you came up with "2%" or how you didn't fundamentally understand what he was saying.
Yeah, the word random was probably wrong, but I got the feeling he was referring to the more arbitrary process of choosing a method.