Having read the materials, it seems misleading to call it the invention of assembly language. More like the invention of machine programming, i.e. what the paper calls "coding of problems", i.e. turning a problem into machine code.

The mapping of machine code to symbols seems completely ancillary, and as a side comment says, without the demonstration of an assembler and an intent to translate in the other direction, it is premature to say any language has been invented, vs. notation for writing a paper.