No you're misunderstanding - it's not a mistake - I read quite a lot from HPC and they specifically talk about 'codes' in their literature. It's just how they use the word.

Here's one other random example that sounds normal to HPC people and bizarre to most other industries.

"Debugging parallel codes can be incredibly difficult, particularly as codes scale upwards."

> https://computing.llnl.gov/tutorials/parallel_comp/