So why not just bring two phones to the Olympics with you? Go out and buy a $40 phone and load only the required apps to it, and don’t use your normal Google account on it. This phone would be kept clear of all personal information except what is required to attend. If you’re traveling with friends, have them do the same and let them share your hoax-google account with you so that as you and they turn the phones on and off, the tracking of you and them bounces all over the map as an undefined person that is just sharing some ambiguous account. And keep it turned off in all except for the required times. Then bring your real personal phone with all of your normal apps and logins on it also. If the Chinese government spies on your phone then and your Google profile, they only get what you intend them to get, which includes a lot of mis-direction and no additional personal data. Everyone in your group could also friend the false person on Facebook and then share the false person’s posts with everyone in the group. That would allow everyone to stay in-touch and to communicate anonymously with everyone in the group, using either their personal/private phones or their $40 phone.
Use encryption and VPN services on your real personal phone and no security what-so-ever on the $40 phone. They might even think they have everything on you while they only have what you chose to let them have.