In front of an impressionable audience, Pres. Duterte usually gets carried away with his story-telling and says things that are false and vulgar.
Spewing out false claims has become a standard practice for Duterte. I think it has come to a point when he believes his own lies.
That is dangerous because he is president and many of his statements are basis of government policies. The most glaring example is his figures on the number of drug addicts in the country, which is his justification for his brutal anti-drug war which has killed more than 27,000. At the start of his presidency, he said there are three million drug addicts in the country. Then it became four million. Yet, the Dangerous Drug Board reported in 2016 only 1.8 million drug addicts in the country.