Actually, the last thing the tech world needs is stuff like this, from the article:
If a startup is pre-product/market fit, growth hackers can make sure virality is embedded at the core of a product. After product/market fit, they can help run up the score on what’s already working.
Stop making up "markets" and "niches", then making crappy products to try and be "viral" in these areas, then calling yourself a "growth hacker" or something as ridiculous and valueless.
Build something because you love it, not because a "growth hacker" determined that it was a "pre-market fit".