I have the OG before me and that is what I referred when I posted the excerpt.
But I'd tend to disagree with the interpretation that Algebra covers topics like Probability, statistics and the like.
I do not have any problem if the DS questions cover the same areas as the Problem solving or Word problems. But the guide definitely needs to expand its ambit when mentioning the coverage.
If possible, can you pin-point me to the location in the OG where Algebra is said to be including these other areas (or I can content on the lines you mention)? I am concerned that I may have missed reading a paragraph or two.