It's a tax write off. Look at the people they showed off as Pro users in the presentation.
People say this, "it's a tax write off", as if it means it's free. Do you really think that's how it works?
Tax write-offs mostly just reduce the taxable income by the marginal tax rate - if that's 15% for eg a privately-owned business, that's a 15% reduction as an expense. (And note I'm leaving out of this whether the computer as an expense is amortised over several years, meaning even less immediate tax reduction)
To be clear that 15% is a made-up rate but it's not like businesses are generally paying 100% tax rate on profits.
(Okay if you're an employee and someone else is paying for it, all the better - but that's not the tax write off)