I don't think GP is asserting that the multimodal encoding is "more rich" or "more accurate", I think they are saying that the felt modality is a different thing than the text modality entirely, and that the former isn't contained in the latter.

Text describes semantic space. Not everything maps to semantic space losslessly.

It's just a description, not an encoding.

Language encodes what people need it to encode to be useful. I heard of an example of colors--there are some languages that don't even have a word for blue.

https://blog.duolingo.com/color-words-around-the-world/

> text definitely encodes multimodal experiences

Perhaps, but only in the same sense that brown and green wax on paper "encodes" an oak tree.