Will it change what I said?
No. Every claim in the output has to trace to a sentence in your draft, and a sentence that cannot be preserved safely is kept and flagged rather than smoothed over. That constraint sits in front of everything else the rewriter is told.
Will this beat an AI detector?
That is not the promise, and anyone making it is guessing. Detectors change weekly and any text can be edited past one, including by this. What you get is prose that stopped carrying the marks — which is the part an actual reader notices, and the part you were worried about anyway.
Is using this cheating?
Editing your own writing has never been cheating, and that is all this is — a faster pass at the wording. The thinking, the facts and the judgement calls are yours and stay untouched; what comes off is the accent the model left on them. If the underlying work is not yours, no rewriting tool fixes that, and this one will not pretend to.
Does it sound like me?
It can. Paste a few things you have written and it measures your rhythm — how long your sentences run, how much that varies, how often you run short — then shapes rewrites to those numbers rather than to the default voice. That measuring happens in your browser and needs no account. What it does not do yet is pick up your vocabulary, so out of the box it sounds like you in shape and like one considered voice in word choice.