piece of tu question was migrated to Super User recently. From the hold reason, it seems 3/5 people chose to vote as
Questions must demonstrate a minimal understanding of the problem being solved. Tell us what you've tried to do, why it didn't work, and how it should work
So that means, the migration option was not selected. As per Require more than simple majority of close votes to migrate, questions on Stack Overflow require 4/5 migration votes. So how did this get migrated to Super User?