Per the article they can help guide you around the website and help with "if you run into a problem that a chat or phone call can’t solve". Also per the article they are using "LivePerson to support their chat"; LivePerson being a 3rd party program.
I'm betting in the end more often than not it will end up the CM doing something and the guest not necessarily following along lol
When I worked at the insurance company we used to love when IT (who was stationed in Canada) would take over our screens as it meant a few moments of not having to think very hard. That said it was because they were trying to fix stuff on our computers whereas this with Disney the intent just appears to help visually navigate a guest to something over just verbally describing it.
Sounds kinda like they are trying to have an option on teaching people navigation on WDW's website. That will work for some people who want to learn and do things on their own but for whatever reason are having issues navigating the website. I've always said that WDW's website works great for those who have at least some website navigation skills...by works great I don't mean stability in the userface I just mean navigational.
I never want to see your insurance company's internal website if you think WDW website navigation works great. It is not intuitive at all IMO.