I'm not seeing where he is offering to help with English. He says he's from the US sure but lots of American citizens and non citizen residents are not natives. Was he claiming to be native in his profile? I feel like I am missing something that may be obvious? Maybe his last name being English?

I have been contacted by at least 4 people on this platform who were scammers. The last one, Joel, has stolen the picture's profile from an American journalist. I reported the problem to Italki and immediately their profiles were removed.
Scammers typically create fake online profiles designed to  lure you in. They may use a fictional name, or falsely take on the identities of real, trusted people such as military personnel, aid workers or professionals working abroad. Their messages are often poorly written and full of mistakes, even if they say to be American or English. Do an image search of these people. They use stolen image for their profile. You can use image search services such as Google. I used this system and every time I found these images on the sites where scammers were reported.