The host nation always wins the opening match.
Across 21 editions from 1930 to 2022, the host won the opening match 17 times, drew 2, and lost 2 (most recently 2022). The frequency is high (about 81%), but the claim of 'always' is straightforwardly false.
Busted17 / 21
Host wins, openers
// verdictBUSTED