You can't squat over 1000lbs for 20reps?
As NYIron said, thats one way of looking at it and it does work, up to a certain extent. But sometimes in order to instigate new growth, other techniques must be implemented, as its impossible to maintain increasing by 1 rep and/or increasing weight over very long periods. Thats where negitives, failure sets, drop sets etc, rest pauses, supersets etc. come into play, to help push growth to a new level that cannot be obtianed through simply forever progressing.
Its good advice for someone new to lifting though, but seasoned lifters won't get the full benefits, especially if theyv been progressiively overloading for a year.
But yeah, back to the OP; i think the questions been answered