“Smarter than the Rema, the Maharal, Aruch Hashulchan, Chasam Sofer, Rabbeinu Bachyai, the Alshich, the Radvaz, and the Chida combined?”
Probably smarter than none of them individually, certainly not smarter than all combined. But today we have access to information they did not have.
As an example, Rabbeinu Bachya in Chovot HaLevavot has a proof of the existence of God that involves severaly descriptions of the concept of infinity. Many centuries later, it was discovered that his description of the nature of infinity were not accurate. Today any good high school calculus student understands this material. Does that make thousands of high school calculus students smarter than Rabbeinu Bachya? Chas v’shalom! That proof is not necessary for the important spritual truths contained in that sefer.
The sceptics will use this to disparage everything from Rabbeinu Bachya and to disparage our sages in general. We must not allow this to go unanswered! But denying that our sages did not have access to all the modern information we have at our disposal today is not an valid argument.