@Eric Gade I think we might have a different view of the relationships between "literacy", "[insert adjective] literacy" and "tools for thought". Of course, these are just agreed upon terms, so I'll try to explain just my personal view.
"Literacy" denotes, for me, the ability to use written language (of any kind, even graphical) to store ideas and to aid in communicating them.
"[Adjective] literacy" denotes the ability to appreciate and make use of ideas that make up knowledge generated by the field of [adjective]. It doesn't prescribe any medium through which the ideas should be communicated.
"Tools for thought" I view as any "stuff" that strengthens someone's ability to think. Thinking is a process, so I don't recognize eg. Obsidian as a tool for thought (it's a knowledge base; it doesn't transform your way of thinking). I'm aware that this is very different from the self-description of the TfT community.
Mathematical objects (some of them) do qualify as tools for thought because they actively enable new ways of thinking / they transform your thinking. Mathematics itself is concerned solely with the study of mental objects, mental tools, and mental processes.
I'd say that mathematics and literature (and their corresponding literacies) are complementary, being examples of "thought-toolmaking" and "knowledge-toolmaking", respectively. The latter is concerned with preserving and representing ideas, the former is concerned with manipulating and generating those.
Computing can be used to realize both of these, although it's being used mainly for the latter (proof assistants don't really provide a good math UI, simulations aren't composable). Perhaps this is what I should've said, as it more reflects my view of the real potential of computing.
Please, feel free to challenge these views, descriptions and relations. Also, be aware that the term "tool for thought" / "thought-tool" is overridden here to mean a different thing, the original meaning being replaced by "knowledge-tool". However, the notions of "literacy" and "[adjective] literacy" aren't meant to replace their "actual meaning" - so they in particular should be challenged!