I haven't looked at the code, but basically they write a comment to that older post that you want to upvote, and set the beneficiaries as the author... although now it looks like they're only setting the beneficiaries to 65% instead of 100%. Any post/comment can have beneficiaries set... Steemit just hasn't built that functionality in yet... but it's all there available on the blockchain.
RE: We are launching a new service called Steem-Forever
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We are launching a new service called Steem-Forever