They could try but as far as I can see, that video is opinion and suggestion. I would be utterly, utterly astonished if there was any chance of winning.
Not at the sizes of those organisations no. Of course not. Dow Jones is a massive publisher and their words would carry weight. It can be VERY easily argued that the Times or the Herald Tribune could "Defame" someone considerably. A video from a conspiracy theorist. Not really considered a medium that will:
A - be seen by millions of people
B - be taken seriously by all the people who do see it.