Western European languages like English, German

... and Spanish? Do you forget that Spain exists, is in Western Europe, and is where Spanish spread from, or? Spain alone produces around as many scientific publications as France, Italy, Japan, Australia, Canada, Russia, etc. depending on the year – impressive considering it's both less populated and poorer than those countries – and including Latin American countries like Chile, Mexico, and Colombia makes Spanish surpass all languages other than Chinese and English in amount of scientific literature. I'm also not sure where you got the idea that the German language contributes more to human knowledge than Chinese, China produces far more scientific output than the US and around 4-5x as much as Germany.

Something tells me you don't speak any 2nd language, you've never left the country, nor are you involved in academia or qualified scientific research at all, and you're trying to speak about things you don't know about. You're some sort of pseudo-intellectual who has no qualifications or talents, but thinks you're on the same level as actual philosophers by copy-pasting links of news articles about problems you don't actually know anything about to Reddit and Lemmy.

I work in a computational natural science and much of the general humanities, philosophy, linguistics, and psycholinguistics literature I've read from the modern era is in Spanish, and plenty of Spanish papers are incredibly rich & high quality despite them. It's impossible to ignore non-English languages' significant contributions to scientific knowledge, and especially the Spanish-speaking world's impact on modern science.

Regardless of that, the amount of papers about iguana mating written in a language isn't relevant at all to migrants. If anything, a population speaking different languages is a good thing for science, because that kind of separation encourages thinking about and discussing problems in a different way, and adopting different focuses or techniques. Throughout history, many divides in science coincided with language divides, with the most prominent scientific breakthroughs often coming from people in different "camps" which coincided with the language they spoke, e.g. the Arabic-speaking world would have their own views on a specific problem or field which eventually turned out to be the dominant view, and the Italian-speaking world, and the Greek-speaking world, and the Latin-speaking world, and the German-speaking world, and the Judeo-Spanish-speaking world, and the Akkadian-speaking world, Hebrew & Aramaic speaking world, and the Chinese-speaking world, and the French-speaking world... many languages encourages many forms of thinking, and encourages innovation.

The dominant languages in the US/UK/Canada, China, Germany, and France have the most scientific literature available because those countries' governments are able to spend an extremely large amount of money to subsidize and drive scientific research, and have large relatively well-off and well-educated populations to become scientists. With the US seeing an increasing number of Spanish-speakers in their population, it's likely it'll eventually see a large rise in Spanish-language scientific literature produced in the country at some point.