I just watched the epi on tv.. They shot the whole VIku entry scene without Pooja.. They used Pooja's close up then.. . So that shoot was done during weekend as Pooja was on leave then.. So Parth must have gotten back earlier than we think..
... yeah right, Pooja didn't even have a single dialogue too in the whole scene otherwise she does thow something here and there 😕
And you're right maybe... also, Pune isn't that far from Bombay so who knows he might be travelling back and forth...? Or maybe his mom is staying with him in the new house for a while to keep him company...