“you THINK based on the verses he quotes that he means what you think he means”
It is very clear that Ibn Ezra to Devarim 1:2 means that there were some post-Mosaic changes to the text of the Chumash. It is also clear that Chazal thought the same thing (see Kiddushin 30a). Rashi and the authors of Midrash Rabbah clearly had a sefer Torah with variant spellings, see for example Rashi to Bereshit 25:6 and Bereshit Rabbah 61:4.
I’m not sure why Artscroll claims that it is a unanimous opinion that there have been no changes to the Torah since the time of Moshe Rabbeinu; that clearly is not true.