I presume alternate realities to be different from alternate futures. An alternate future is something that generally is used as a warning of what is too come and where our characters could end up if a great evil is not stopped. Where as an alternate reality is a separate earth with its own distinct history and changes that could not take place in present continuity. So a time-skip in an alternate reality for me is not an alternate future.
I’m not trying to argue with you by the way, I’m just giving my mindset and where it’s at with all this.