The Ohr HaChaim quoted above is far from a Da’as Yachid.
The Malbim, the Netziv, Rav Hirsch, and many other Gedolei HoAcharonim regularly explain Pesukim differently from Chazal, let alone Rashi and the other Rishonim.
The Ramban in multiple places in his commentary on Chumash makes it clear that we are not bound to Chazal’s interpretation of the Pesukim, a point he makes explicitly in his Sefer Haviku’ach.*
There is no question that, as the Ramban says, Rashi is first and foremost among the Meforshei HaTorah. This, however, was never understood to mean that we are required to follow his interpretation.
The ban seems very strange to me.
*There are, of course, those who say that the Ramban didn’t really mean it, that he just used that as a winning argument in a debate. To my mind, this is a slanderous accusation, which amounts to the assertion that the Ramban espoused kefira because it would help him win the debate. The Chasam Sofer (in his Teshuvos) accepts that the Ramban meant what he said, and that he intended it in reference both to Midrashim and Aggadeta Gemaros.