I think that sidebar is fine.
After all, it just assumes all the listed racial traits are equal, and lets you switch out one for another.
The fact one of the listed options (Keen Senses) is strictly inferior to the switched-out one (Skill Versatility) could be called a blemish on the quality of the book, but it truly is harmless.
After all, noone is forcing you to choose Keen Senses over Skill Versatility.
In fact, let me come up with a hypothetical to show you why it isn't so unreasonable to include Keen Senses on that list.
Let's say the original Half-Elf trait isn't Skill Versatility, but something else that has nothing to do with skills. Let's pick Fleet of Foot, the wood elf trait that sets your speed to 35 feet.
That sidebar would have instead read "You can replace Fleet of Foot with Keen Senses".
Now, who's to say Keen Senses is worse than Fleet of Foot?
Keep in mind none of you are complaining Fleet of Foot is on that list. In other words, none of you are objecting to the comparison of 2 skills versus +5 speed.
And yet, comparing Fleet of Foot to Keen Senses feels very reasonable.
So it's only because Keen Senses and Skill Versatility happens to be numerically comparable that you feel a mistake has been made.
And if you for a moment ignore the implementation, Keen Senses is a key elf trait, one that all elves get. I can completely understand why it got on the list.