No, it's not. Read the 10-K. It includes pages upon pages of the breach-related expenditures, including hundreds of millions of dollars spent on extra stuff like credit monitoring, legal fees, and professional services costs. That's not "just IT/overhead costs".
Just because a company was planning to spend $400 million anyway doesn't mean that having to spend that $400 million on breach-related expenses is no impact. The budget doesn't just come out of thin air, it gets allocated from other places. Spending $400 million on breach-related expenses means not spending that $400 million on something else like product development, research, marketing, or other company initiatives. The impact is enormous.
>In the grand scheme of things, it really isn't a huge impact to them.
You have no clue how businesses work if you seriously think that an additional, unexpected $400 million in expenses (almost 50% of their yearly net profits) "isn't a huge impact to them". That's really all that has to be said here.