The satellite ESPN+ channels are just the limited set of events that they were already carrying on the ESPN+ for Business channels, which they can now make available to residential users because of ESPN Unlimited. Stream customers already get all the events on those channels and more through the ESPN app on channel 210 or via Sports Central which has deeplinks to games on ESPN, Apple TV, Peacock, Prime Video and other apps. ESPN likely requires that for stream/internet so they can sell targetted ads during commercial breaks.
On satellite they use guide banners that link to one of the 9500s if they're targetted, those channels just have a slate with information on how to redeem it. Stream customers get an app popup or notification with that information if they're targetted.
They did recently start making the Tennis and Golf experiences in the 900s available to streaming customers. And now that they have a deal for ESPN+ integration, hopefully we'll see the return of the Australian Open and Wimbledon experiences that had to be dropped after the court specific channels left ESPN3 for ESPN+.