You did just fine.
If I grow up with people speaking 3 languages, that is just 1 language to me. I grew up around English, Spanish and a Native American language. Those are all just 1 language to me.
Therefore, according to Hatuey I am probably smarter than most people on this forum.
Studies such as he presents are pointless because language isn't a singularity. Bilingual people are bilingual because they grow up around more than 1 language - not because they learned another language. In those settings, those 2 languages are effectively 1 language because essentially all people use both.
Their "proof" of being smarter doesn't really prove anything either. People around conflicts are likely to more develop better skills at dealing with conflicts. That doesn't mean they are smarter.
My point is rather simple. Obvious really. Would it be superior if you and I were unable to communicate with each other? Would that be "better?" Would we then both be smarter? Could we better live together in the same house? That is what he and some others are effectively claiming. The more people in a culture who can not communicate with each other the better.
And that is absurd.