I cannot help but think that sounds like they are doing A/B testing on which strategy is more effective at making users change their reviews. Nothing wrong with that, btw.
If you're advertising & selling version 1 of a product, the reviews should be for that version. Enticing users with a newer or superior version shouldn't make them change the review for the version 1 item.
If a user does update their review, it should state that a replacement was sent that is better, yet different, and possibly provide a link to the better or updated item.