Corp Fin EOC problem: why no depreciation?

Hi All, any help very much appreciated here… On page 75 of the Corp Finance CFAI book, the vignette section about Dominion Company does not reference any depreciation of the grinders in reference. And then the answer to the problem solving for NPV for the project also including no depreciation add-back or anything. Why is there no depreciation add-back needed in this problem? Is depreciation already fully taken out pre tax and then added back in since the problem cites “after-tax operating cash flows”? Thanks!

Yes. please do number 27 (ATOCF).