You can believe whatever you like, Roussette. This is the direct account of the journalist who made the call to Serena, and what she told him, however - he is directly quoted throughout this section so there can be no suggestion it was speculation by the author.
Yes I can. And I will.
As I say, I would rather listen to what comes out of Serena's mouth than a journalist. Obviously, if SW hadn't said anything about a friendship, there is no contrary evidence, but there is more than one interview with her talking about her friendship with MM.
The VF article I refer to was September 6, 2017.
When she says this...
“Her personality just shines,” Serena said about Markle, who asked her advice on how to handle some of the more extreme results of fame, such as paparazzi showing up at her house and chasing her. “I told her, ‘You’ve got to be who you are, Meghan. You can’t hide.’ ”