There is zero evidence of medical implants disappearing. Zero. There are many cases of misdiagnosis where scans have been misinterpreted. So it seems to me far more likely that that’s the explanation, and indeed there are any number of medical negligence cases that confirm misdiagnosis.
To date though, no healing evangelist has provided any evidence other than saying ‘they are healed’ , and no healing evangelist has submitted any evidence for peer review by doctors, which is the normal process for new theories.
I think it’s spectacularly cruel to give the sick false hope. Paraphrasing someone here, but when someone religious offers to pray for my family when they are ill, I thank them for their concern. It’s a nice gesture - it shows they care. But, don’t stop the medical treatment!!