Griffin is
still too stubborn to slide properly and until he does there's little hope of him having a long career.
While I am very unsure about Griffin's long-term NFL future, this article is from last November; we have no idea if he has spent all off-season practicing his slides (I doubt it) & has perfected the art. Citing it on March 30th as evidence that he is still too "stubborn to slide properly" is ridiculous at best, and intentionally mis-leading at worse.
Furthermore, the article itself shows a play where Griffin didn't slide (he dove forward to try to get extra yards) and says "this is not how you safely slide to end a quarterback scramble." No ####-it wasn't a slide, period. If I showed a video of Pat McAfee kicking a FG and said "this is not proper technique for punting a football," my statement would be accurate, but it wouldn't have any value, and neither does this article.