If you want on of many direct quotes from them “DT-2 phase with the target to complete all project goals including the Q=10 project specification”. Guarantee may be a good little overstated, but Q=10 is a very pessimistic estimate.

https://www.iter.org/fusion-energy/what-will-iter-do

Really the actual science bits are focused on the breeding blanket, remote operation, material science, etc hitting a high Q on DT doesn’t matter with the world’s supply of tritium so minimal. DEMO might be targeting Q=100, but that’s only useful if the tritium supply is sufficient and the timeline ends up way faster than starting in 1978 to only see a ~2033 first plasma.