Seems like bureaucratic neglect. Someone failed to submit the names of these guys to the pacemakers list and that's why they were wearing competitor bibs:
https://www.theguardian.com/...e-jie-allowed-to-win
"FTP is a bit 2015, don't you think?" - Gustav Iden
https://www.theguardian.com/...e-jie-allowed-to-win
"FTP is a bit 2015, don't you think?" - Gustav Iden