Where’s a real world example of a nuclear plant being built in just 4 years?

Chinese SMR.

https://www.reuters.com/business/energy/china-start-commercial-operation-first-small-modular-nuclear-reactor-2026-2025-12-11/

Ontario is building 4 SMRs, the first will be operational in 2028.

This thread is like US nuclear, 40 years behind.