The costs look unrealistic to me.
With any business you have some overheads and costs, but you also have control over expenses too.
I very much doubt people are spending a big wad of cash on new bodies and lenses every year, you can trim costs with s/h equipment and I would not expect a serious outlay on lenses if you've been around for a while. Other areas such as computers well again you've no need to dump $4k on computer either. And I'm pretty puzzled how you would spend $1500 a year on hard drives.
Some of the cost listed are IMO excessive for a photographer, maybe he's super busy so I can get part of that. But you control costs and there are many ways of doing that. One reason many work from home that kills any cost of a studio (but it also will bring in revenue so that has to be balanced) gear purchases can be curbed significantly too by being a bit more selective. Expenses such as phone, car/maintenance etc have always been deductible business expenses.
The important part here is to make sure you don't exceed your income with expenses ie make a loss. If that means you have to cut down your gear lust buying then that's life.
It is just an example to show all the different line items that need to be considered. Line item amounts may vary considerably from one photographer to another. Maybe this example represents someone who needs top notch equipment in top notch condition, and it is getting used heavily in very difficult conditions.