So I've been reading the book blackjack secrets by Stanford Wong, and I've gotten to the chapter on high/low card counting. In this chapter there is a table on early surrender, and when it is best to do it. I'm confused because it's in this table it says to always surrender in hard 13. And that obviously goes against basic strategy.

Right before the table, in the paragraph explaining it, it says that the table itself, only really has relevance whenever the count per deck is high. But also in the table itself, there are specific scenarios in which you should surrender if the count per deck is at a certain number. When referring to hard 13, it says you should just surrender no matter what. I don't understand this. I don't know if I'm missing something. I'm hoping someone can help me out. Please and thank you.