Long and short of it is whatever we say is immaterial if they say no or want it removed thats that. Your health is not worth you saying no never is.
The main point if they have an MRI then they must have a wand (at least they have to in the UK) if they are concerned they can use the wand to check whether it will be an issue. The thing with the implants is if it isn’t a magnet then you are almost certainly going to have zero reaction.
I have said I will once I have disposable money pay to get an MRI on video with my implants to prove there is no issue.