I see marriage rates falling by about 50% over the past decade. But this claim seems unlikely, or perhaps just badly skewed by the seasonality of things.
He is probably talking about the "520" Marriage Day. May 20 is a popular national marriage day (due to tradition) and many couples choose to get marry on that day in China.
This year's 520 marriage rate is ~40% of last year's.
This year's 520 marriage rate is ~40% of last year's.
https://xueqiu.com/5539280156/251074532