> is there any advantages of using untyped programming language

without any evidence, i claim the corpus might have higher quality variable names and conventions that are "human crutches" around not having types.

LLM knowledge in your non public codebase must be strictly local, and so checking on details and identities of types incurs a cost for the LLM to go fetch that info. if the LLM can "just know" (guess with very high confidence) then thats better for the LLM.

> non-typed languages has more traning data

as per anthropic "poisoning llms with 250 examples" finding, i suspect that corpus size does not really matter that much for any language that is reasonably well used.