The actual change here is "Detroit had a net gain of 12 startups over three years".

That, and the comparable stat for Michigan as a whole, are the only growth numbers actually present in the article. And even the author rightly admits that we're talking about a tiny starting number. Remember that XKCD about rapid growth and small populations? (https://xkcd.com/1102/) To be a bit cynical, this looks like a submarine piece for the Michigan Venture Capital Association, which is the source for 100% of the article's data, including the filler stuff about investment sectors that adds more statistics without advancing the actual growth thesis.