Terrible advice - quitting your job to be a founder does NOT instill you with the necessary skills and mindset to be a successful founder. The skills required to succeed as a founder does not appear just because you call yourself a "founder". Things like negotiating with difficult co-workers, identifying what defines good team work chemistry, charming your boss, charming your underlings, etc., are all challenges better encountered in your current work environment than when you start your company (and screw it up due to lack of experience).
Jumping into the water before learning how to swim because somebody said "hey, the best way to learn how to swim is to just do it - that's how I did it!!"
The most difficult challenge for young adults inexperienced in the adult world of employment/business (corporate politics, backstabbing vendors, non-paying customers, unscrupulous business partners, etc.) is separating the noise. I believe this post (although well meaning) is "noise" that will harm more than help.