And to be a T&C + wayback machine nerd:

T&C 11 Aug 2024: "you will need to have earned at least 20% of your Qpoints or have flown 4 sectors ... on flights either marketed* or operated** by Qatar Airways."
T&C 30 May 2025: "you will need to have earned at least 20% of your Qpoints or have flown 4 sectors ... on flights marketed* and operated** by Qatar Airways."

So it used to be "20% or 4 sectors, marketed OR operated"; now it's "20% or 4 sectors, marketed AND operated". Maybe they just haven't updated their systems yet as I would slide in under the old (OR) definition with 20%.