Yes, that is one possibility. It does not seem obvious to me in Isaiah. I weighed up each individual feature and considered how likely an update or archaicisation would be. Several of the features in Isaiah 40-66 are complex in terms of grammar and syntax and are therefore very difficult (or almost impossible) to revise in an update. But that doesn't mean it's impossible. It just makes the option less likely.
Yes, that is one possibility. It does not seem obvious to me in Isaiah. I weighed up each individual feature and considered how likely an update or archaicisation would be. Several of the features in Isaiah 40-66 are complex in terms of grammar and syntax and are therefore very difficult (or almost impossible) to revise in an update. But that doesn't mean it's impossible. It just makes the option less likely.