A paper wallet doesn't really need any special tech. And a paper wallet + a time locked transaction towards that address already does the job.
I don't know, do more complicated solutions make the blogs or newspapers look more interesting maybe?
This is a sort of paper wallet.
A paper wallet doesnt mean the wallet is made of paper. Paper wallet, in a broader sense, means you are storing the private key in plain text or some very simple encoding (this is subject of the article).
Time locked transactions are irrelevant on the case, as this is a gift, and you want the Satoshi to be in the immediate availability of the recipient (she could spend the Satoshi tomorrow, if she wants).