When printing an overhang the infill builds a angle to it that is not removable and is as thick as the external layer? I built it on tinker cad and sliced it on Creality Slicer 4.8.2
Have you considered rotating it 90 degrees and printing it on its side? It looks like it wouldn’t need any support structure in that orientation. I can’t see the whole model though, so I can’t tell if there are features that wouldn’t print well that way.
I’ve never used Creality Slicer but haven’t heard anything good about it either. I would consider using either Cura or PrusaSlicer.
I agree with @CoreyPDX looks like auto generate supports. I would consider rotating the part if possible to avoid supports.
I was under the impression that the Creality slicer is based on Cura and I use both that and the Cura ver 5.3.
Neither have given me any problems. I would agree, looking at the model that printing it on its end would save the need for support. If not, try the tree support