Earlier quoted context omitted.
Like you said, if the employees filed an 83b, they would be in the clear. However, the article’s talking about some of Stripe’s earliest employees, who might not have elected to file an 83b because the company was still unestablished and risky, and filing the 83b meant potentially paying taxes on shares that might ultimately be worthless. And since these are the company’s early employees, I imagine that Stripe is doi…
If they were the earliest employees the stock should have been at par value, making the tax payment minimal. Later employees typically get options, which don't have the tax issue. So I'm still unclear where the tax bill is coming from.
Whether those employees may or may not have been able to ameliorate this by making an 83b election is moot at this point. They clearly didn't, so now something has to happen if the company wants to keep them around.