In those examples, it seems to me they were mistaken about how they perceived something rather than what they perceive, the 'implementation detail' of the experience, rather than its content.

Most of the time we just experience things, and we don't think about via which modality we do so. This is not surprising, as unless when explicitly called for most of the time such knowledge would be quite useless. When you are blind, it's likely there comes a time you wonder, or were asked, how you managed to navigate as well as you do. Here you will apply some lousy introspection and your brain will serve up some lousy post-hoc 'explanation'. Thereafter, that hypothesis will just become an additional belief you have about what is going on with your perception.

Of course, modality seems quite intrinsic to various qualia. 'Red' is obviously a visual thing. 'Birds chirping' obviously an auditory thing. But the understanding of 'red' as visual is a meta cognitive process separate from the visual experience of 'red' itself. For example you expect 'red' to be amenable to being painted on the surface of an object, when the same is not possible for 'chirping'. So no, the modality is not part of the content of the subjective experience.

I would put it this way: You can be wrong about what your experience is referring to out there in the world or elsewhere in your body or mind. But you cannot be wrong about the contents of your immediate experience.