May be there is some logic, though it doesn't fit into common sense. If only 7% saw covid cases, some how it became 25% death of family members and 76% are willing to take vaccine. The more it goes to expert's hands, more people believe. When Media goes hysteric, molehill becomes mountain. No surprise there. But, Despite endless media's hype against Modi, people still voted for him. In the case of Covid, PM also promoted this pandemic stuff whatever may be his considerations.
I am going with the assumption that they didn't rig the poll, as they prided about the accuracy of Mood of the Nation poll even if it didn't fit into their agenda.