This should be acceptable since your field isn't something like creative writing. Of course, your advisor needs to agree. But this is just another tool. Spell checkers are ubiquitous and, while this is a bit more sophisticated it doesn't introduce any ethical issues.
Be certain, of course, that paraphrasing doesn't change the meaning of what you want to say. But it can be helpful if the writing seems less pedantic.
OTOH, it is worth the effort to learn to improve your writing, say, by taking a writing course at some point. If you think the tool is providing an improvement, think about why that is for each use.