Is a writer a writer if they only use technology and don´t write with their hands?
A writer is still a writer even if only using technology in the sense that world creation is possible.

Hand-writing craft is merely personal, as manual dexterity-wise like, that has to do with healthy brain coordination.
Is a writer a writer if its grammar is not good?
Writers reveal imagery, thoughts, new worlds, and alternatives while writing. We automatically adjust oral language, but the language or grammar is secondary.