No. You still LP the bench and press the way it's written in the book. It's just that when it eventually stalls and won't move anymore, you're no longer doing SSLP for those lifts because you can't. So you add more volume.
And volume isn't going to kill you, but you do need to titrate up and start at an intensity that you can handle. So if your squat stalls at 300x5x3 for example (three sets of five), I wouldn't drop down to 290 for 5x5.