Potential long time contributor is somebody who was already asking annoying questions in the irc channel for a few months and helped with other stuff before shooting off th e PR. If the PR is the first time you hear from a person -- that's pretty drive-by ish.
I always provided well-documented PRs with a narrow scope and an obvious purpose.
Not to mention LLMs can be annoying, too. Demand this, and you'll only be inviting bots to pester devs on IRC.