I don't disagree. Let me go back and check my post. I think I did qualify that was the formula for ideal exponential growth, and that the actual rate will reach some limit due to environmental conditions. I didn't mean to imply populations necessarily grow exponentially, and it is entirely possible of course for growth rates to be zero or negative.
Malthus agreed with you in theory and developed the whole "we are going to overpopulate" idea.