And (from the article) Iris development was funded almost exclusively by Lotus, under contract, with an exclusive option to purchase all the IP generated. That sounds a lot like a wholly-owned subsidiary.
Most laypeople think in terms of products, not corporate entities. The various international Google subsidiaries are all separate corporations, yet the lawyers & VPs who set them up aren't considered "founders" of them. Meanwhile, business units that operate with significant autonomy and generate a product that's distinct from the parent company's main business usually do have a "founder" figure.
Where would you put Android on this continuum? It's a business unit within Google now. However, it's run with a large degree of autonomy, has its own codebase, and creates a product quite distinct from Google. And moreover, it actually was founded by Andy Rubin as an independent startup, but purchased well before they got to market.