According to the article, the DoL has found pay discrepancies and wants more data to confirm its findings. From the article:

Herold added: “The government’s analysis at this point indicates that discrimination against women in Google is quite extreme, even in this industry.”

Wipper said the department found pay disparities in a 2015 snapshot of salaries and said officials needed earlier compensation data to evaluate the root of the problem and needed to be able to confidentially interview employees.

“We want to understand what’s causing the disparity,” she said.

Herold told the Guardian that the department “seeks additional information to ensure the accuracy of the department’s findings, because if the findings are confirmed, this is a troubling situation”.