I got it to work finally, with a newer version, through manual building: paraview Build guide ArchLinux and importantly, with VTKM option off.
So, the version that works now:
Client Information:
Version: 5.9.1-RC1-940-g43007029b9
VTK Version: 9.0.0-3883-geb332ee027
Qt Version: 5.15.2
vtkIdType size: 64bits
Embedded Python: On
Python Library Path: /usr/lib/python3.9
Python Library Version: 3.9.4 (default, Apr 20 2021, 15:51:38) [GCC 10.2.0]
Python Numpy Support: On
Python Numpy Path: /usr/lib/python3.9/site-packages/numpy
Python Numpy Version: 1.20.2
Python Matplotlib Support: Off
Python Testing: Off
MPI Enabled: On
Disable Registry: Off
Test Directory:
Data Directory:
OpenGL Vendor: Mesa/X.org
OpenGL Version: 4.5 (Core Profile) Mesa 21.0.3
OpenGL Renderer: llvmpipe (LLVM 11.1.0, 128 bits)Connection Information:
Remote Connection: No
However, when I install OpenFOAM (any version from AUR or the Arch4Edu repo), it pulls older version of ParaView and this manually installed version stops working. Uninstalling the OpenFOAM and the AUR ParaView brings the manually installed Paraview version to work again. Very cumbersome, looks like I cannot use ParaView & OpenFOAM in a single ArchLinux machine 
'( . Anyway, that might be a topic of another post. For now, if no OpenFOAM is installed, the manually built ParaView works…