I am too, but I’m still on excessive levels of copium and hopium.
In this thread from February 2020 a blue post double-checked that some of the posters had successfully linked their legacy accounts to their Reforged account, stating that “The classic stats should become available in a future patch”:
In this support article (Article ID: 258720), updated 3 months ago (!), they state that the stats are saved in their system:
“At release, Classic stats were not visible in-game. However, your stats are saved in our system. We plan to make stats visible in-game in a future patch. Your Classic stats do not contribute to unlocking Warcraft III: Reforged achievement rewards”:
If we could get additional confirmation on this from a blue post it would be greatly appreciated.