A quick search shows you can edit this as well... That is interesting though, I didn't know it existed

Give me a couple hours and I could build something that makes pastes appear to be keystrokes. Give me a weekend, and I can build something mathematically indistinguishable from a human typing that will hold up to intense scrutiny

It still doesn't prove anything, it's just one more piece of circumstantial evidence. Still, it's not unreasonable to paste the full text into it, or mix and match. Maybe you don't have word installed on your computer - I don't, I haven't since I was in school myself. It's reasonable to use word on school computers but do all of the work on an online text editor, then pasting into word on a school computer