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I found this number highly suspect. As they were unable to even cite an official making this claim I'll provide a source that does give a more realistic figure:

• senectus1 6y ago
  I mean, it's still an impressive number of people... but yeah a lot less than 38M: So far, floods have affected 37.89 million people in 27 provinces, autonomous regions and municipalities. As many as 141 people are dead or missing, and 28,000 houses have collapsed. A total of 2.246 million emergency evacuations have been made, according to Zheng Guoguang, vice minister of emergency management
• boomboomsubban 6y ago
  Both articles mention the 38 million number, I suspect that is the number of people ordered to evacuate their home while the number who have actually evacuated the area is the three million number.
  • entropea 6y ago
    I've worked emergency communications and 911 dispatch during wildfires and a surprising amount of people don't leave their homes during an evacuation order.