You need to read the full statement to see that there's likely some embellishment going on.
"On the girls’ side, ECNL is a recruiting goldmine for college coaches. According to FC Alliance, as much as 70% of ECNL moves on to NCAA Division 1 college soccer any given year. On average, around 90% of ECNL players move on to play college soccer in general"
Do you believe that 90% of all ECNL players go on to playing soccer in college? This statement likely came from several years ago before DA and GA existed, around the 2014 time frame. Here's an article with the statistic from back in the day.
Nine of 10 players from the ECNL’s graduating class will play college soccer, the league announced on Wednesday, which is national signing day for NCAA sports. The Elite Clubs National League (ECNL), a nationwide league that is considered the highest level of girls youth soccer in the United...
equalizersoccer.com
With college rosters limited to 28 players and more youth ECNL clubs than college teams the statement just doesn't seem possible.