I’ve had the same problem as well. Based on this reading this line in the FAQ, I recently got back into warframe on my PS5 (after the cutoff date), hoping to play some warframe before i get to merge my old PC account into my PS5 account, just to find out they changed it???!!! Like you cant just misinform players and make them spend money in the new accounts, and just suddenly remove it from the FAQ and hope that no one noticed it. That is incredibly poor from DE, I will be contacting support for this.
You created an account after the cut off date, and they still allowed you to merge it with your old PC account? How does that work cuz i have a newly created PS5 account too.