Matches in this league mean absolutely nothing. Recently, for example, the Netherlands won 4-1 against Belgium. Do you really think it will be the same at the World Cup? That game could also have ended in 1-8. At the World Cup you see a completely different team. As mentioned before, many players but also coaches consider these matches as practice matches. The only thing is that it counts for the FIFA ranking, in which points can be earned. Those matches are played when the competition is already over, nobody wants that of course. And the risk of injury is also quite high because of that.
Everything that happens in matches between nations cannot be used as a benchmark for one country to be able to show an impressive performance again when they start the 4th annual event, even though some teams appear so impressive in matches between leagues of nations such as Portugal, the Netherlands and also Poland. we can't guarantee whether they can repeat their success in the world cup next November, considering this is only a friendly tournament so not all countries play optimally