Rambam Laws of the Jews 7

Hello Rabbi, I came across a halachah in Rambam that seemed very puzzling to me, and changed my entire way of looking at the figure of Rambam.
Laws of the Seventy, Chapter 2, Halacha 3:
"And all these enemies are in one matter, and that is that he should not turn to idolatry. And whoever turns to it in the way in which he does an act is defective, and it is not idolatry alone that is forbidden to turn to it in thought, but rather any thought that causes a person to uproot the main principles of the Torah. We are warned not to bring it to our hearts, and we will not distract ourselves from this, and we will think and be drawn to the thoughts of the heart, because a person's mind is short, and not all opinions can attain the truth over his ignorance. And if every person follows the thoughts of his heart, he will be found destroying the world according to his short-sightedness. How will he sometimes turn to idolatry and sometimes think in particular of the Creator, whether He is or not, what is above and what is below, what is before and what is behind? And sometimes in prophecy, whether it is true or not, and sometimes in the Torah, whether it is from heaven or not, and he does not know the standards by which to judge until he knows the truth over his ignorance, and is found to be coming to terms with the differences? And on this matter the Torah warned, and it is said in it, "And do not turn after your hearts and your eyes, which are you whores." That is, each of you will not follow his short-sighted mind and imagine "Whose thinking reaches the truth, thus the sages said, 'After your heart is this sexual immorality, and after your eyes is this fornication.'" And this, although it causes a person to be troubled by the world to come, is not subject to punishment."
 
How did the rabbi understand Maimonides' words? Is Maimonides actually claiming that objective research is forbidden? If so, then why did he write Mo'n?