Let me ask you this question then.
Is it your thought that even if the United States had not put ships looking like this to sea, similar hulls and the component design, Singapore would have come up with this design on their own?
I’m not trying to knock Singapore, but I do think some of their claims have to be taken tongue in cheek.
Form follows functions: the US doesn’t need these (much smaller) ships.
As I quoted earlier, Singapore took Swedish assistance on this and Sweden has been building and exporting similar small ships suited for the congested and contested waters of the Baltic. There are a lot of countries that have a niche in smaller vessels like these (Germany/Sweden/France/Italy etc.), who don’t mind providing technical assistance to others. The US is not a big player in that segment.