Earlier quoted context omitted.
That is misleading. If a company is high growth, their median tenure is going to be low.
The article mentions leaving, suggesting that it does not inlcude employees currently employed
It's a misleading article and the study was misinterpreted across the industry. For example here, "The average number of years at tech disruptors and titans"
It doesn't say average numbers before employees leave: https://insights.dice.com/2017/08/22/tech-jobs-last-2-years-....