It cooks in the liquid from the surrounding ingredients. You can do this with a sufficiently wet enough Lasagna quite easily.

Indeed we regularly eat "oven pasta", the raw pasta goes in to a sauce into the oven. 30-40 mins and it is al dente (with crispy cheese on top).

Ah ok I missed that your link was for ziti. I thought you were talking about spaghetti or other non-baked pastas where you typically just pour sauce over.