A solid move to instill faith with advertisers that what is left of "the platform formerly known as twitter" will be stable, avoid confusion with their users, and be a brand-positive environment.
What's everyone's timetable for either shutdown or sell-off of twitter, 18 months. Ad revenue will continue to shrink, effective 'cost per' rates will decrease while Ex-Twitter will try to squeeze out stable or higher, likely push brands toward longer term campaign spend, engagements so as to reflect long-term dollars on a balance sheet.
Only reasonable counterpoint would be if this is part of a strategy to convert X to a portal with Ex-Twitter being one app/platform tied to central identity graph with other services/platforms to be connected later.