I would dispute that. The risk with grass cuttings is that it can compact and exclude air. It then undergoes anaerobic decomposition which can get get very smelly. Have you ever been near a silage pit on a farm?
Good composting requires oxygen so that aerobic decomposition takes place. If you mainly have grass cuttings, then mixing in some more woody material to keep the structure open will allow the air to flow. Turning the compost over regularly will also help. A well tended compost heap with good aerobic bacteria should smell like good freshly dug soil after a rain shower.
https://www.gardeningknowhow.com/compos ... ls-bad.htmIf your compost smells bad, this is an indication that something in the balance of your compost pile is off. The steps to composting are designed to help break down your organic material faster and, a side effect of this is, to stop compost from smelling bad...