This isn't the first "Powerful person is Opus Dei" claim on this site I've had trouble confirming.

Sure. I saw he was a reporter and assumed there was some reporting, but no I haven’t seen any clear evidence after a search afterwards. Now the argument over Opus Dei and adjacent organizations influencing is another aspect. (Influencing through politics, think tanks, and patronage, not Dan Brown).

Opus Dei has earned its dubious reputation but I also think that it has become the object of conspiracy thinking among a subset of people