Some humans apparently only or almost only do non-verbal thinking. It’s called anendophasia.
Doing non-verbal thinking has nothing to do with not feeling pain, I don’t think it sounds like philosophical zombies at all.
Do you find this study to be accurate or inaccurate in any ways?
https://pubmed.ncbi.nlm.nih.gov/38728320/
Pdf seems available here: https://www.semanticscholar.org/paper/Not-Everybody-Has-an-I...