Profiles Are Like A Preview
I think you can refer to a person's profile as a preview of their writing and proofreading style. However, it's not necessarily the best indicator of their ability to give story guidance or deeper story editing.
I'm fairly sensitive to errors like that. It would make me choose a different editor. But I tend to think of proofreading as a different skillset.
There are also some people who want to let the Modern Language Association run their lives. For example, not using the word "impact" as a verb. If you really want to get pick- picky about things (like: last night I dreamed not last night I dreamt) you can find yourself in a situation where your stories are changed to sound correct, but far from what a native speaker would actually say. I think it depends on the outcome you're looking for. (...the outcome for which you're looking.)