In the article, it says this:
Posted on: May 18, 2017 at 22:31:38 CT
DC Jayhawk KU
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"The 18 calls and electronic messages took place between April and November 2016 as hackers engaged in what U.S. intelligence concluded in January was part of a Kremlin campaign to discredit the vote and influence the outcome of the election in favor of Trump over his Democratic challenger, former secretary of state Hillary Clinton."
Admittedly, this was at the end of the article, so you may have skimmed over it.
The contact this article refers to occurred during the campaign, something Trump has denied ever occurred, repeatedly.