So you eliminate as sources any company that might have some staff "sympathetic" to the Muslim Brotherhood? That probably extends much further than you think.
>BOOOOM!
You didn't say anything revelatory or even exciting.
I think you're accidentally overstating the strength of their case, probably just the clause-level equivalent of a typo.
They actually said:
> some of whose staff have links to organisations sympathetic to the Muslim Brotherhood.
So, just to be clear, they're excluding anything with (interpreting the vague language generously) <=3 degrees of separation from the Muslim Brotherhood (organisation -> staff member -> an organisation -> Muslim Brotherhood) as a reliable source.
Totally unscientific, but to put this in a kind of very loose and silly context, Facebook claims that its users are on average connected to every other user by 3.57 degrees of separation. I suspect that the figure for this kind of connection is actually, relatively, much higher, but I sincerely doubt it's all that much higher than 4 (i.e. enough to make this sort of connection relevant) - especially when you think that these aren't even friendship relationships, but something so much weaker!
edit: the link to Facebook's claim - https://research.fb.com/three-and-a-half-degrees-of-separati... and some typos and omissions of my own