The author does cover this point, further in the thread.
> An example:
> A company has $1.2M in revenue; and $1M in costs (let's assume all costs are employing devs fulltime).
> Before 2022: the profit of the company is $200K. Pays corporate tax on this.
> In 2022: the profit of the company is $1M (of the $1M in salaries paid for devs, this needs to be amortized over 5 years: so $200K can be amortized for the year). Need to pay corproate tax on this. But the business might not have this much cash on hand, and so needs to borrow at a high interest rate. MASSIVE change!
> ... and so now companies are incentivized to have as little R&D expenses as possible (aka fire fulltime devs doing R&D, unless they can front the 5-year spread).