It's not a deconditioning or deloading workout, because it's at the beginning, not some bridge in the middle. It's meant to give you a type of running start, as you ramp up the weights every week until you start hitting heavier weights. Building a type of foundation, I guess.
I've heard from Needsize to start a month behind. So, 20 lbs. under a weight you can still do, but struggle a bit with, for 5x5. Something like that.
In the end, just make sure your first 2-4 workouts are more are less easy and let the weight go up slowly.
If I were going for strength though, I'd choose something like Westside over 5x5. The routine works, but I don't think it's the best way to go about it.
And then size has its own ideal little quest.