That sounds bonkers!!! Surely it is a typo. Roast Spaghetti? YUCK! I (and DS1 (8) made fresh tagliatelli yesterday. Huge success....and I promise you we boiled that (3 mins) and it was lovely. I think roasting it would have been a disaster!
But it's not like a pasta bake at all. This seems to involve roasting some dry pasta, putting it in water to soak for hours in the fridge and then boiling it. You'd have spent hours prepping your pasta and that's without giving any thought to the sauce.