I didn't believe it blindly and that's the reason there is a ticket, after thorough investigation of the error in code as well as self-hosted instance configuration and log file analysis.
Also to make sure others do not need to go through the same long process of debugging, try to request the project maintainers to change this marketing claim as evident in the ticket. Please check the ticket and see for yourself. I did it to make sure others facing the same problem can see it before spending too much efforts to debug.
I can see the amount of work minIO team has put in this project and again kudos to the team. Open source is hard and requires a lot of commitment.
This is how open source works, you give back to community in the form of feedback, documentation, issues and if capable in code.