Yes, that project is a collaboration of a group of Russian and Spanish mathematicians.
The problems are in style that is emphasized in the Russian-style enrichment for math-gifted children. A problem is not about applying an algorithm and getting a numerical answer. Instead, each problem is about discovering a math idea, and coming up with a rigorous explanation.
That is an excellent chance for a child to practice the type of math that is not emphasized in regular US school curriculum.
The project is 2 years old, and so far has been successful. If your child decides to participate in the Olympiad, then she (or he) should be ready to commit her time both on solving these problems and on writing the solutions down.
