It's wild to me that they wouldn't try this first. Feeding the asm directly into the model seems like intentionally ignoring a huge amount of work that has gone in traditional decompilation. What LLMs excel at (names, context, searching in high-dimensional space, making shit up) is very different from, e.g. coming up with an actual AST with infix expressions that represents asm code.
I've been doing some decompilation with Ghidra. Unfortunately, it's of a C++ game, which Ghidra isn't really great at. And thus Claude gets a bit confused about it all too. But all in all: it does work, and I've been able to reconstruct a ton of things already.