It looks like there was documentation for VisIt bridge readers once upon a time. For example, a quick search turns up the following URL, which is now dead:
https://kitware.github.io/paraview-docs/nightly/python/paraview.simple.VisItTecplotBinaryReader.html
Edit: It looks like there is documentation for PV 5.8.0:
https://kitware.github.io/paraview-docs/v5.8.0/python/paraview.simple.VisItTecplotBinaryReader.html
Is this class deprecated/removed in 5.8.1?