Singapore has US military base
Singapore does not have a US military base.
Singapore has US military base
Singapore does not have a US military base.
Strictly speaking, you're correct. According to US agreement with Singapore, LCS are rotationally deployed to Changi Naval Base. Singapore also allows US military to use Singapore's air and naval bases. There are some fine distinctions between access and military base. I didn't want to go into these finer details because my larger points stand regardless.
The biggest "fine distinction" will be that the agreement does not allow for the US to mount combat ops out of SG bases. Nor torture centres