Not sure if that’s in reference to a particular company’s trouser, but in general trousers are perfectly fine for a business casual work environment.
EDIT: OK, you’re talking about these from ASOS. Again, yes, you could wear trousers in a business casual workplaces, however, I wouldn’t buy those trousers. They’re completely synthetic fabric, meaning they won’t likely last long, plus you’ll end up sweating in them. I also wouldn’t trust their construction to hold together very well.