For some reason, they have nerfed humans on purpose. I don't know why, maybe the extra feat doesn't match what they have in mind, but it is assumed that the game manuals have already revised that content to make it balanced. They also give them a totally useless ability to carry more weight, which makes me laugh and stupefy. I don't know if they are really laughing at us or they just want us to play the other races for some specific reason.
I honestly couldn't say.
I am personally inclined to think it is a Wizard of the Coast change though because BG3 is releasing so close to One D&D releasing next year and the changes are the half-way between D&D 5E and D&D 5E (which is what WotC is insisting One D&D should be called, so we don't get confused by the difference.)
