Unfortunately, phone CM's are notorious for giving incorrect or made up info. I think it's really unfortunate that the CM told your wife this when they obviously did not have solid info and you were banking on the Skyliner when you made your resort choice. Disney just announced the Skyliner will be open in "Fall 2019".
https://www.wdwinfo.com/news-stories/disney-skyliner-will-open-in-the-fall-of-2019/ I would not count on August falling into that ambiguous "Fall" opening date.
Funny story - we once had a server at HBD who went on and on about a new attraction she "knew" was coming to DHS. After talking about it almost every time she came to our table, when it came time for the check she said, "well, I get all my info off Facebook, so it may or may not be true". At least she admitted she didn't really know if what she was telling me was accurate!