I don't fully understand what you mean.

Are you saying that if we have the potential to create an asi, it should have been created already?

If this is what you mean, then it perfectly natural to conceptualize something that can't be created yet: Da Vinci thought about tanks and other devices way earlier than they were constructed, and science fiction imagines technologies that come to be true years later.

Also, afaik there's no consensus on the possibility of an agi (artificial general intelligence*). Some people believe it to be an inevitable development, others don't.

*I've read agi defined as an AI that can solve a wide range of types of problems without being specifically tailored to one task, like GPT3 is for text, for example.

Tldr: we don't have the technology yet, and some people believe it's not possible, some possible, and others inevitable.

As for the question if it's possible to create something that doesn't yet exist, that's true for any technology wich by definition didn't exist before being created.

Perhaps you could clarify the question.