I don't know if I buy the idea that using the vendor parts as examples given in the article align with the analogy.

Architecture is not that; MEP trades aren't architecture. If she used prefabbed wall assemblies or didn't do her own structural for critical parts the analogy would hold (I so not know if she did or did not either way). Plumbing is a completely separate trade the way trading stocks is separate from computing; it just happens to live in the house.