This is a silly and myopic article. That sounds harsh but I can't think of a nicer description. Moreover, the author himself describes doing it for far less ($10k). I don't mean to be a curmudgeon here, but IMO, I think articles like this hurt more than help. Tossing out a not low but semi-attainable number is just clickbait.

In reality the amount of money varies by many orders of magnitude. It can be as low as $1k (your basic legal costs and some cheap hosting) to as high as $100mil (you need facilities, manufacturing, warehousing, retail channels, etc, etc). Each business is different and how much you will need to "get to sustainability" will vary based on the market niche, strategy, competition, positioning, market landscape, timing, regulatory burdens, etc, etc.

Hell, even for something fairly well defined business concept like "start a bar in a medium-sized midwestern US city" the costs can vary by an order of magnitude depending on the specifics.

Better advice: research your market and plan out what you think you'll need. Estimate the various expenses that lead to revenues, including the time-delays between when you spend and when you receive funds. Then do it again for a less-than-rosy scenario. Finally accept that your guesstimate is probably wrong and go for it anyway!