Okay, I'm not getting drawn into this OCD vortex. Just one or two more free lessons for you to privately internalize and publicly ignore, Cite, and then you can have the sandbox all to yourself. For a while, anyway. 2 randos joined the club just to tell you to shut up while I've been here, so I'm sure it will continue.
obviously an ESL
"obviously an ESL learner"
"obviously an ESL student"
You can't say someone is obviously a language, though, unless you don't really know what you're talking about.
the company ESL writers
"The company's ESL writers."
Oh, so you self-corrected that mistake, great... not. That lack of a possessive is a real tell.
closer to their language usage style
Awkward. "Their means of expression" is nice. "Their caliber of writing." The sky's the limit, if you actually know what you're talking about.
When your English grammar is as bad as the OP's, that person does not have the right to complain.
Awkward, ironic. "That person" goes back as a referent to both "the OP's grammar" and "you," neither of which really works.
He should thank the writer
"They should thank their writer."
You've been over this error yourself, by yourself, to yourself, in another thread. Self-study may not be the best route to knowledge that sticks, in your case.