Everyone makes typos. In all honesty, most admissions officers are only skimming your essay the first few rounds. There’s a chance they may catch it (the human mind is programmed to mentally fix most typos). But even if they do, then it’s a big question of if they’ll get the gist anyway and if they’ll care enough about one typo to reject.
College counselors stress typos and editing for good reason - we want to make sure your chances are as good as possible and want to account for anything that can be accounted for. But ultimately, part of my position is I have students obsessively check for typos because - even though there’ll always be a few - I’d rather have a few than a lot.
Honestly, I think one reason we also stress about typos is it’s something we can control…unlike, say, the past four years of a life or if a counselor will like an essay topic…