As I understand "30 hours/week for 12 months at more than 1 job = 1 year full time (1,560 hours)", it means 30 hours in total in, say, two part-time jobs. For example, you work 10 hours per week in one job and 20 hours in a different job. That adds to 30 hours.
Part time is always counted how it is.
Full time is defined as "30 h/week". No more, no less.
More than 30 hours per week counts like 30 hours.