Free Reforged?

I own a Copy of the Warcraft 3 Frozen throne classic disc but not the base game. and I am seeing things that say because I own the game I don’t have to pay for the reforged version. Is this true?

If you have a RoC CD key you can link it to your account and get SD Reforged for free. This will not include access to HD, or the updated campaign.