There is no changes made related to stripline in recent releases. However, I observe that the JSFiddle provided in the other forum thread seems to be working fine. Also the color property is not set to transparent in the JSFiddle that you have shared. Setting it to transparent (currStripline.set("color", "transparent");) seems to be working fine. Please take a look at this updated JSFiddle for complete working code.
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Vishwas R
Team CanvasJS