Exactly what I was thinking - I know if I were reading something on camera, I'd WANT to practice in advance.
I used to make all sorts of recordings and announcements for work, and would always try and get the required text in advance (unless it was a true emergency, and couldn't) and practice it several times in advance, just to get comfortable with it, or even tweak something to make it flow better, if needs be. And for the most part, they weren't even foreign, strange, or "different' words! Just a part of hat I considered my due diligence for my job, and I wanted to do it as well as I could.