Hilton HHonors - Smarter Living lists 10 airlines to get 500 miles bonus to sat at HGI?

Smarter living under "Ways to Earn Miles" lists 10 different airlines that give 500 miles when you book directly with HGI or H if stay at HGI. Have you tried this? Or, is this a "misnomer" and these are the same 500 miles you get from Douple Dipping?

Probably just the regular 500 mile Double Dip for Hilton Garden Inn. I haven't seen anything offering double miles for HGIs only.