I see the stylistic differences that scholars point to, both with Moses and with Isaiah, but I disagree. If you looked at my writing one, two, three, and four decades ago, you could conclude that each of those writers was a different person from the one posting today. Considering how much Moses lived through in addition to the normal perspective changes that come with age, it would be surprising if his writing style remained fully consistent throughout the Torah.
I agree.
Well and truly stated. Selah