Google/Facebook both minted several thousand millionaires at IPO. The vast majority weren't CXAnything.
I don't know whether the article is about income or wealth, but if one puts "big money" at, say, $250k of gross income, then it's clearly achievable in software. Options include a) get a job at AppAmaGooBookSoft and stay in it for 5~10 years or b) hang out your shingle as an independent consultant and charge $8k+ per week at 75% utilization.