So one aspect in one article may not have been 100% correct. Papadopulos did have contact with Russians and lied about it to the FBI. He pled guilty to it. His own communications showed Papasmurf there was trying to set up a meeting between Russians and Trump and that the campaign was aware of it. I dont know how the allegation was so not startling that agents immediately dismissed it but apparently then read it in the NY times and began an investigation. You know what gets investigations started? When they ask people about allegations and they lie about it. Which Trump campaign officials seemed to be do quite a lot.
The one aspect was the most important one. The whole start up of the case depended on it.
We have no idea if he lied or not in regards to what the FBI was pulling. Even if he did lie it didn't cause the investigation to be started.