I was never a fan of Sanaya's last show (although I was of Sanaya) but even to me Teri Meri and Jaadu Hain Nasha Hain will always be associated with Arshi. In fact when I hear those songs Salman, Kareena, John and Bipashu (forget any other TV actors or shows) are farthest from my mind because the magic created on the show far surpased anything in the original films..Apart from that there was no need to play any song from Sanaya's previous shows. I think you also said that the PH didn't watch IPK well then someone on the production team should have researched Sanaya's last show even to see what the highlights of the show were and those 2 definitely were amongst the most memorable parts of the show - so i agree with the TM the PH's research team should be more aware of the career of the star on whom they are banking the success of their show. If it was some misguided attempt by the PH to bank on Sanaya's success with that particular song then it misfired big time.
To add insult to injury is the fact that the song was not appropriate for the situation and that's something that keeps on happening with this show. I think the general discontent with the production value of the show is making situations such as this appear to be worse than they actually are. The PH needs to figure out who Sanaya is and who forms the majority of her fanbase because they haven't been able to make a connect with the general viewing audience as of yet and now are also irritating Sanaya fans.🥱