I think the point was not so much whether it's good or bad but that by weeding out the possibility of a C student from being in the bootcamp pool to begin with,

I think the point was not so much whether it's good or bad but that by weeding out the possibility of a C student from being in the bootcamp pool to begin with, it means the success of bootcamp interview candidates will be higher than any given college student just because they're better/more skilled-- not because they did bootcamp over university. I.e. you're comparing apples to oranges because bootcamp-educated candidates might actually be a more skilled subset of the overall candidate pool.