I use Meshmixer to check some models that may be questionable. When the model is imported, portions are outlined/highlighted in red and blue, while reversed normals take on a striped appearance. For minor/smaller errors, the feature Analysis/Inspector will make an attempt to repair. For more severe problems, the netfabb online repair service has surprised me at how well it works, but it's not universal either. Another surprising repair utility is part of Windows 10 3D builder program. PrusaSlicer 2 will also perform repairs. When imported into PrusaSlicer, the slicing process and "playback" shows the huge gaps in the build caused by the errors.

The model you attempted is so flawed that none of the available resources will solve. The Thingiverse post is a model that was created using a clearly flawed process.