This has been explained time after time. There is no correct torque setting on the oil plugs, not unless you can turn the whole scooter upside down and get the area around the plugs, inside and on the threads completely dry of any drop of oil. Torque settings are for clean, dry threads. The threads around the plugs can never be clean and dry, because small drops or even just the oil film, almost invisible to the naked eye will be on the threads. If you cleaned the threads and did manage to get them totally dry, 10 seconds later another drop of oil would move into the area. You cannot fool mother nature and all the laws of gravity are in her book. Any oil will seek a path toward the core of the earth, slowly maybe, but always continuously.
There is no correct torque setting for lubricated threads and as long as gravity keeps pulling the oil film or loose drops of oil left inside, the threads will continuously be lubricated by the remaining oil inside the engine and transmission. If you put a torque wrench on the plugs of any vehicle that has previously had oil in it, the threads are not going to be clean and dry, and you are not going to have any real idea how much torque you are putting on the plugs, because the lubricated plugs will not have any resistance much to turning tighter until they are far past the recommended torque settings.
There are some guidelines for torquing lubricated threads, but the guidelines are not specific, because the kind of lubricant on the threads; any wear on the treads; any grit in the oil dripping down; the temperature; the type of metals in contact; and a whole book full of other factors affect the torque setting. Most of the guess work of adjusting the torque for lubricated threads claim that you reduce the torque by 25% to 40% of the dry and clean recommended settings. So you are already in the territory of fairy dust and unicorn farts before you come up with some figure to use, and may possibly have moved completely out of the accurate range of your torque wrench before even beginning.
All you can do is run the plugs in hand tight and then turn them on down about a quarter of a turn, then STOP. If you even put a torque wrench on the plugs you will be over-torquing the plugs before getting anywhere near some imaginary torque value for lubricated threads.
The manuals can say whatever they want to say, the engineers can say whatever pops into their heads too. Nothing they say or do can stop gravity from putting oil on the threads and there is no such animal as a torque setting for lubricated threads. Remember those people who fitted the plugs with a tiny little Allen hole or Torx hole to tighten and loosen it instead of a hex head that a socket can fit on - they are the same people who came up with the imaginary torque setting for oil plugs!