Simple Flying is generally rated as unreliable. en.wikipedia.org - Perennial sources

In the news conference, Trump said Obama weakened standards and “I changed the Obama standards from very mediocre at best, to extraordinary. … Then they changed it back — that was Biden.” (This is false, Trump left them unchanged.) washingtonpost.com - Faa dei trump fact checker

FAA statement to Fox News in April 2024: "Every FAA-certified air traffic controller has gone through months of screening and training at the FAA Academy, and that is before another 18-24 months of training to learn specific regions and airspaces. There is a well-known national shortage of air traffic controllers, and the FAA has ramped up outreach to ensure no talent is left on the table. We are accelerating the pace of recruiting, training, and hiring to meet demand while maintaining the highest qualification standards."

newsweek.com - Faa reject air traffic controllers race airport crash

We need to know what actually happened and what the reasoning was. A five week course isn't very far along. But Trump lying is normal.