Because he can use his rational powers of observation and inference (otherwise known as instinct) to judge other peoples' assertions about the world. Studies, experts, and statistics are not required to analyze a narrative.

This is satire, right?

It's not personal anecdote if it covers whole country

It's a personal anecdote because their conclusion was based on their own research and purchase of sustainable pellets used to produce heat, not to be exported by one country and used in a retrofitted coal plant to produce electricity.

It's just a completely off-topic, unrelated story. They heard "wood pellets bad" and told their "wood pellets good" story.