They definitely make saltwater tanks. It looks like they design them for stores, etc. the logs etc. are options that you can buy if you're using the tank for other purposes. I seriously doubt they are Dutch Made, (why would that matter anyway, what are the Dutch known for making besides wooden shoes?)
However, they may be made by a guy named "Dutch"... This is a "mom and pop" store trying to break into the tank building business...If you scroll down to the bottom of the site, you'll see they use Homestead to build their site. Homestead is a site building software that is free, typically used by Quickbooks owners who want to build a cheap site. Any company that has enough money to come across the ocean to provide fish tanks, is not using Homestead to build their site.
I'm sure the guy can make a nice tank, but I'd feel better going with something that is manufactured by some of the bigger players. Do you need a custom built tank for some reason?
But I'm 99.9% positive that this "IS NOT" a Dutch Company. It's a guy who happens to build tanks for his local Pet stores.