Those from abroad (expats) spent 2000-3000k and locals without kids spent 1000-1800 (as also shown in the video) This means expats drive rental prices up simply because their budget is 50-100% higher. But they also add to the vibe in the Netherlands :) Expats also contribute to the economy and rarely cause any problems hence I am still in favor of having expats.
It is not because expats budget is bigger. Locals get subsidised housing as they sign on early with their council. Expats come in from outside rent those same properties for five times the amount. They basically get fleeced.