I think it could only help. I feel stans biggest problem is they don’t have any particulates in their standard sealant. The last time I tried stans, which was a couple years ago, I did put some glitter in it. I just didn’t get a puncture that I knew of to see if the glitter helped. Surprisingly, when I changed the tire I didn’t find a single spec of glitter. But as others have said patching would be better.
They must have added this text to the bottle? 2 years ago when I used it there was no indication like this. But I agree with their finding, stans does not seal over 40psi.