Deload as it says. There's a reason Jim has that in there. there's a decent amount of volume in 5 3 1 and you'll need the rest to recover.
Also, you will tap out on this after some time. When that happens you might want to use a different program for some time , such as a Westside approach. But not forever. Take your new maxes and go back to 5 3 1.
I was doing my own thing and quasi Westside for years. I just did my first 5 3 1 on deadlfifs last week. I suck at reps because it's been so long since I did them. I'm hoping it pushes me over the hump to 600 lbs.