Okay I'm gonna add some context in case anyone doesn't know or remember
There's been a group of people on the internet called "Team 0%" (link it to their website, where you can also find this info), who've been working towards making the original Mario Maker for the Wii U have every level cleared
They though this level, named Trimming the Herbs, would be impossible for a human and would stay uncleared, because it was clear tested using a hardware cheats, something though to be impossible for the Wii U until the creator admitted to using them 7 years later, so the team decided to not count the level due to this
However, the person playing in this video, Sanyx91SMM2, after 100 hours of practice and attempts, managed to beat it without any tools on April 5th 2024, becoming the first to ever truely clear the level, days before the servers shut down
To signify this, team 0% decided to make the completion percent on their website say 101%, treating it like the secret final boss of Mario Maker