We had this happen too around 10 months after illness. I think they get a bit more aware of what they want and with us it was 2 weeks of illness with NF then Z woke for a NF for the next week before I realised he didnt need it but was waking for it IYKWIM.
I would certainly wait until you are confident he is well, even if it means a trip to the Drs to say you want to check ears and throat etc are clear.
If he was an independent sleeper with no NF before he will go back to it pretty quickly when he realises its not on offer anymore
We always removed the NF by DH doing the settling at the NW (as I was BF) and DH did anything he liked to help Z sleep - but I couldnt go in and feed
Also - Huge developmental leap around 10 months I think
wont help