First off, what do you consider 'smart'?
I don't consider memorization any indication of intelligence, but this is often conflated as being 'smart'. There are many doctors and software engineers who are monkeys with a good memory. By Instagram metrics, they are 'smart' because they have paper and high paying jobs, yet not only stand on the shoulders of giants, literally cannot comprehend the work they had done in some cases centuries before. I also think that the person who crafted the Antikythera mechanism was probably a genius despite not knowing what electricity was or Beyonce's birthday.
If we consider 'smart' people to be a confluence of raw intelligence and education, and remove the memorization aspects that stem from a civilizational body of work as some sort of lame "I win because Wikipedia exists and therefore everyone in 2023 is a genius" forum trick, I do not agree that average people are 'smarter' today at all, because education specifically has suffered immeasurably. Not just for the average, but also the highly intelligent. Every football player or affirmative action entrant is a more intelligent person not being developed. That's not even taking into consideration general genetics due to demographic changes in these areas.
While people today may 'know more stuff', this is principally done through rote memorization and not detailed study of a field. This is demonstrated to me every day anecdotally, and is supported by countless peripheral studies and the show 'smarter than a 5th grader'. Admittedly, since education is a multi billion dollar industry, of course there will be no highly publicized critical look at the adapted Prussian education system's efficacy as it has been adapted over time to the civil rights regime and service economy in a post-industrial nation.
The test I posted isn't so much about the 'facts' it's about the process and capacity which requires both education and intelligence to pass. Just a simple thing like not having multiple choice is a non starter in 2023 outside of edge cases like a few certain degrees or a few remaining private schools.