Yes, we have the confirmation, For those curious
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Just adding interpretation of this video clip from a Western analyst. The tone in the video feels more upbeat.
There was a commentary on the WS-15 (page 14 of the July 17th issue of Aviation Week by Steve Trimble) referring to this Conference.
"China is considerably behind the U.S. and Japan in ultra-strong aviation steel, especially various advanced rolling, cooling, and heat-treatment technologies."
Earlier in the article, "high-purity stainless steel" as specifically mentioned.
The last sentence goes like this:
"Qiang Wei, program lead at the AECC-affiliated Beijing Institute of Aeronautical Materials said in March that the WS-15 is now in serial production, but China's wrought superalloy materials supply chain remains too weak to support the country's military engine production road map."
Seems Trimble used the English translation of the video to come up with his article. I didn't hear anything in Chinese about "wrought superalloy" but the English translation has that.