Plagiarism is claiming someone else’s specific work as your own. Using a generative tool is closer to using a compiler, an IDE, or a library. I’m not copying a person’s code or submitting someone else’s project with the name filed off. I’m directing a system, reviewing the output, editing it, and taking responsibility for the result.

If I paste in a blog post verbatim and pretend I wrote it, that’s plagiarism. If I use a tool to generate a starting point and shape it into what I need, that’s just a different kind of authorship.