My opinion is that it is worthless as a measure of aptitude. I do lots of C# technical interviews. In particular there was this one candidate that scored fairly well in IKM, but the summary noted that he was slightly below average speed in solving problems and should not be put on a time-critical project. You know, the standard IKM statements. Anyway, technical interview rolls around and the candidate can literally not string 2 lines of code together. This was for a senior dev role. Did not know how to parse a string to a date.
So he obviously cheated (before GPT) and that is where all his time went. So no, IKM is worthless .