As soon as you use any tool there is a risk percentage for such. Generally, it will be more in the 80%-100% side than the other way around. I've even been using handwritten texts with a 80% AI score, so unless you use a very original way of writing you won't score 0% AI consistently.
Anyone may tell you that don't obsess too much with these tools, but I, personally, think that it will be making the difference in the mid-long run. Unless you go on a massive amount of page numbers (like 500+ per day or something like that), if you are going to be doing 2 or 3 articles per day, don't use quillbot or anything like that. Do it manually or do heavy manual editing (and when I say heavy, i mean HEAVY).