Question about the Definitive Edition purchase

So I read that purchasing DE will give you access to the 3 HD expansions. Right now I only have AoC.

My question is if I purchase the bundle in the picture, will I be able to play WK on Voobly with all the expansions before DE comes out, or maybe I just need to purchase DE? Or do I actually have to purchase every expansion if I want to play WK right now?

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https://i.redd.it/4zzops90usi31.png