More money pretty much always helps with growth though. The argument is that they're hiring as fast as can be done (to maintain culture/quality/interview-pace) and they have nothing else they can spend money on. It's not impossible.. but it's a bit hard to imagine there is no way at all to increase your workforce productivity. But maybe they're all working 12 hours a day, making huge salaries and eating caviar while getting massages during their breaks
Maybe it does, but it's not the only way. Microsoft, famously, was bootstrapped.