How is it word abuse? "Architecture" is much more informative than "magic" or "thingy"; it conveys that they investigate how putting together algorithms results in optimization. That differentiates them from Givewell, The United Nations First Committee, the International Risk Governance Council, The Cato Institute, ICOS, Club of Rome, the Svalbard Global Seed Vault, the Foresight Institute, and most other organizations I can think of that study global economic / political / ecological stability, x-risk reduction, or optimal philanthropy.