No, they don’t. Eye witness accounts are intrinsic to the scientific method. If you have some apperatus and you need to read some display and write down a number, like voltage or temperature or whatever, then what do you do if actually witnessing this is disallowed by the scientific method?
Eye witness accounts is not very reliable or good evidence(which is why repeatability and reproducibility, and double-blind test protocols and all that are also part of good scientific practice), but it IS part of scientific evidence.