Yes that is actually roughly the take away here. LLMs are getting so popular in programming not because they are good at solving problems but because they are good at reproducing a solution to some minor variation of an existing problem which has already been solved many times.
Most of the work that most of the industry does is just re-solving the same set of problems. This is not just because of NIH but also because code reuse is a hard problem.
This is not to say that everything is the same product. The set or problems you solve and how you chain those solutions together (the overarching architecture) as well as the small set of unique problems you solve are the real value in a product. But its often not the majority of any single codebase.