## why it said the “The left recursion has been removed at the cost of an extra non-terminal symbol(E1) and a little extra complexity”?

When I read the book “A Practical approach to compiler construction” the chapter 4 “approaches to syntax analysis” and the section 4.2.3.3 Left Recursion, it says:

“The left recursion has been removed at the cost of an extra non-terminal symbol”

I have no idea why say that, since $$A_1$$ still contain recursion?