I've been using Rakuten since its origins as Ebates in the early 2000's and while they always 'reserve the right' to revoke a tracked amount, I have not had an instance where they have reverted my cashback. I have however had items that did not track suddenly appear weeks later! So I'd say its a very high probability if it tracks you will receive the amount stated.
BTW, which style did you buy on your DGC on shopDis?