first of all there is difference between cobalt superalloys and monocrystalline blades.. but since he is talking about DD9 being used in WS-15. that is high pressure single crystal superalloy blade.
DD6 = 2nd generation
DD9 = 3rd generation
DD15 = 4th generation
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DD15 literally display at Zhuhai Air Show 2021 for public.. at that time, this was the most advance high pressure single crystal superalloy manufactured in China. temperature capacity can reach 1200° Celsius without any coating.. and everybody knows the pattern of China. they don't display latest tech unless its successor is already under development or near completion..
so in 2021, 4th generation being displayed in air show.. if you check my old massages, 5th generation single crystal superalloy was under development back in 2021 and we are about to enter in 2025.. remember what Liu Daxiang said in his presentation. ''we also have successfully did breakthrough in next generation engine technologies''..
nobody knows what material/components being used in WS-15 engines.. but we can only guess through bidding information and some inside information..
DD15 being available in 2021 and WS-15 material selection has completed in 2023. now you can guess what components can be used in WS-15 engines.