Yes they have started to roll out this feature lately.
My brother was able to link his Octane add-on card on gpay & use it for UPI transactions successfully
It hasn't been actually deducted. For some reason it's reflected as a debit transaction in unbilled. I have also experienced the same
Wait for the transactions (both ₹239 & ₹114) to get settled. After that it will be updated correctly to ₹239 as debit & ₹114 as credit
The current refferal program doesn't have any provision of FYF card
Anyways this is my referral https://americanexpress.com/en-in/referral/platinum-travel?ref=mDKK1m8&XL=MNANS