It was one of many factors, but the independence referendum voted to stay in the UK by a fairly thin margin. Had this not been a factor, had the people who cared about EU membership voted for independence instead, the independence vote would have won.

They voted to remain in the UK because they thought at the time it was in their best interest to do so. They had no idea at the time that their country would leave the EU. In retrospect, it would have been in their best interest to leave and rejoin the EU.

It can absolutely be described as a bait and switch. Maybe it wasn't explicitly planned as such at the time, but it definitely turned out that way.