I feel the last part is just untrue. If s/he can't help in a coding capacity there are plenty of opportunities to help otherwise. It's akin to having a role in a family.
Of course there are plenty of opportunities to help. However, telling the GF "learn to code so you can help him with his projects" can lead to wrong expectations.
That's true, and I didn't necessarily mean that the gf could/would help code the actual project, but having a knowledge of the logic or syntax could be useful. Sometimes there's just a semicolon missing somewhere (etc.) and fresh eyes are needed to spot it, and a basic understanding of coding/that particular language could help in those situations.
