Speaks to the zeal?

Does "speaks to the zeal" mean "describes/demonstrates the zeal"?

Context:

“In terms of its breadth and depth, this anti-corruption campaign is unparalleled in New China’s history,” a person with ties to the Chinese leadership said, referring to the period since the 1949 revolution when the Communists won a civil war and swept to power.
DEATH THREATS
One item in the Chen dossier speaks to the zeal for naming names: dozens of photographs taken of attendees’ name plates on hotel banquet tables.
Chen did not respond to emailed questions sent to his office about the surveillance, the size of the delegation he brought to Hong Kong or the cost to taxpayers. Telephone calls to his office were not answered.

More:
http://yzweb2014.webcrow.jp/browse.php?u=8E%2FSMvQI1nXIf4OWCCPw2P1u6GP1%2BAJ8RryvbWMPmdh844Mru25D4iBzFXi4I72AGuyG98Myq%2BlbYtCGyvXj%2Bw7iqCuh0bZ%2F3DlohXRenV5deYsr8sJpyLo3F2jfx7wAHOxr&b=29