Aldi announced that it it looking to hire thousands of new workers, as well as increasing their minimum wage to $18 and $23 an hour.
My read on this, is that they are discussing the minimum for two separate positions. Potentially cashier and team leader. Would make sense as they don't have many employees on shift at a time.
That's just being read wrong, it's not written like a "save up to $10" kind of line. The "up" just describes the change (i.e. 'the starting wage is going up; becoming $X'). Within the article, it's completely unambiguous:
The national average starting wages for Aldi workers will be set at $18 an hour and $23 an hour for warehouse workers.