I agree with the intended meaning of this comment. Although none of the terms "engineering", "architecting", "coding" have been defined in this thread, someone who refers to their two decades as "coding" probably does not have a good vision of the intellectual landscape that is out there.
Well yeah, if you are still “coding” after two decades you will probably find it tedious.
You can move into “engineering” and “architecting” however, which involve entirely different challenges, both in type and scale.