Year field is used from the Consumers info.

0:34 Narrator: "From dimensions drag the year from the Purchase information"

0:34 Video: [Drags the year from the Consumers information]

In my opinion, the year from the Purchase information should be used as we need the year of the purchase, not the year when the Consumer joined the platform. This discrepancy might be an issue why fellow learners see different KPI calculations.