There's two take-aways from the article that are concerning, assuming they're true.
The first is that Western journalists / intelligence apparently have access to insiders of the project, indicating a certain degree of infiltration by spies. Not particularly surprising if key members of the team in Shenzhen are dual citizens / former ASML employees since they'd have been top targets for Western intelligence officers.
The second is the claim that China could not have done this without "former ASML employees [of Chinese descent.]" If this becomes the narrative in the West, then expect them to ban people of Chinese descent (not just citizens) from working on sensitive technologies in the future. It's probably too late to stop China's EUV efforts, but people of Chinese descent will definitely find more paths closed in the Western world.