This is a natural reaction and it’s common for people to remark on his high memory yet low cognition, but nonetheless this comment somewhat bothers me. This is my issue, not yours, and I may be misinterpreting, but here’s my thinking...
Why is scientific discoveries even something he’s compared against? What does that have to do with the post? Do all people with excessive talents of some kind have to make scientific discoveries to prove it?
How would you even presume to have any idea whether Kim had wisdom to share? Wisdom is very different from scientific discoveries, and why would anyone know that except himself or his family? How hard did you try to find whether he had wisdom to share? What if he had lots of wisdom that the rest of us couldn’t understand? Are you suggesting that someone doesn’t have wisdom unless they publish it?
Let me ask this way: do you consider yourself smart & wise? What scientific discoveries have you made, what wisdom have you told the world?
We should not draw broad conclusions about the way knowledge and intelligence work based on one person who’s in an extremely abnormal situation. In most normal people, knowledge and intelligence and wisdom are closely related, it takes knowledge (experience) to gain wisdom, it takes intelligence to formulate wisdom, and it takes wisdom to seek the kind of knowledge that can lead to intelligence. For most people, having a lot of knowledge would precipitate some wisdom automatically. Normal people spot patterns. You can’t normally have a lot of one without the others. Kim Peek is a stark outlier compared to how normal brains work.
Your comment also hints at a cultural narrative that is common but not true, where people tend to see someone with extraordinary talents and “remind” everyone that it also means there must be some extraordinary deficiencies there too, because balance. There are some people that have extreme memory and are still smarter and more accomplished than the average person. Marilu Henner is a good example of that. https://en.m.wikipedia.org/wiki/Marilu_Henner