Sorry to say, but that thread is from 2012. I'd say even if the OP had found it, there's a good chance that the rules have changed, and in any case, FT frowns upon the bumping of ancient threads. Maybe a good thing to not always give into that "should have done a search" impulse?

The Bonvoy terms include this tidbit about reservations for others:

"3.1.c. Awards are valid only for use by the individual designated on the Award and are not transferable, although, if requested at the time of issuance, an Award may be issued to a third party. Third party transfers or transfers to non-Members are limited to twenty (20) Awards in a calendar year on a single Membership Account. In the event an Award is given to a third party in accordance with the prior sentence, neither the Member nor the third party will earn any Points/Miles, Elite Night Credit, Qualifying Nights, or Qualifying Stays in connection with such Award. At check-in, the guest using the Award may be required to show valid identification and provide a credit card to the Participating Property for incidental charges."

I've tried called four times in the past two months to make an award booking for family members under this rule, but have failed. None of the agents I spoke to had any idea how to do this. So the awards were issued for me, and my family member was added as second guest.