https://gaming-tools.com/warcraft-3/reforged-blizzcon-2019/
“Another area of concern we’re seeing is regarding online features such as leaderboards and clans, which applies to all Warcraft III players, including those who haven’t purchased Reforged. At BlizzCon we talked a lot about how the team is actively working on standing up the back-end to ensure a smooth transition to this new MMR system, much like we did with StarCraft: Remastered. As with Remastered, these and other features will be included in a major patch for Reforged, which will also address the issue for players of the original game. We’ll share release plans as work progresses in the coming weeks—please be assured that the team is hard at work on standing these features up.”
So they admit at Blizzcon 2019 that the system will be like SCR, they then admit months later the same thing, but have reneged on actually having ladder in at launch