Pointers to Class Members into a class with a private constructor

Lets say that I have a class with a private constructor and that class will be used to represent a single object. Lets say that I have some non-static members that I want to access without using the scope resolution operator. I've noticed that I can achieve this by creating a pointer to the class type to do so. I was wondering why can I declare pointers to that class even if the default constructor is private? Here is an example program.

// Example program
#include <iostream>
#include <string>


class OnlyOne{
    public:
    void Location(){
        std::cout<<10<<std::endl;
        
    }
    private:
    OnlyOne();
};
int main()
{
    //does not work Location() is not a static member
    //OnlyOne::Location();
     
      // doesn't work because default constructor is private.
     //OnlyOne one;
    //one.Location();
    
    
    OnlyOne* two=nullptr;
    two->Location();
}

I've been looking online to see if I could find an answer and haven't been able to get what I'm looking for.