Yes, since Aug '15 IC LAS hotels cancellation policies have to match 100% even when adv. saver fare is gone and bestflex is the only left one available.
So you either
a) book and claim an adv.saver fare
b) book best flex and find an OTA that hast 100% same cancellation policy which is VERY rare
As of their BPG t&cs:
Almost any European state has their own consumer protection agency, you can report to them about false advertising from the IHG website.
In the U.S. you can report them to the: bbb.org but they don't have nearly as much power as cons. protec.agencies in Western Europe.
All in all I'm more than happy that I claimed all my bookings for the Q1+Q2 already incl. breakfast
Its f* up that even as RA Spire you don't even get a free breakfast or lounge access guarenteed (Hilton/Hyatt)