The chip design is top notch. The manufacturing is 3 generations behind. Its manufactured in 7nm. Current state of the art is 3nm. So more like 3–4 years and not 5, but still behind.
We can’t say anything for certain though, since besides the manufacturing width, yields are important too. If they manage 7nm in a high yield its a completely different story than 7nm with a low yield. In a capitalist system no one would go 7nm with a low yield, but in Chinas system economical viability isn’t a priority.