Do NOT relax that tension that you’ve placed on the bar - keep pulling. It should feel like the bar is bending upward in the middle, and indeed, if it’s heavy enough, it will be. THEN put even more tension on the bar, pulling harder until the bar comes off the floor.
This pause has helped a number of lifters for two reasons. First, it tends to discourage dropping the hips right before pulling the bar off the floor. Second, it also allows step four to function as a quick diagnostic step of sorts - when you’ve got a decent amount of tension on the bar, you can assess whether or not you and the barbell are still balanced on your midfoot and you can also assess whether or not you’re trying to keep the bar pinned to your shins. If you’re not doing one of these tasks, you can make a small correction and then pull the bar off the floor.