That is incorrect, the Instructor Manual states:
Waterskills exercises
Have candidates complete five waterskills exercises, earning a combined exercise score of at least 15.There is no passing score for any single exercise.
As long as they score a total of 15 then a 1 is acceptable according to the standards. However if one of my students scored a 1 then I would assume that they weren't trying (unless they had a known physical condition that caused it) and they would fail to meet the minimum score for Professionalism.
A minimum of a 3 is required for each of the 24 dive skills.
Not "incorrect" per se; we merely set the bar a bit higher on the swim tests,
Also set bar higher on skills: had to get a "5" on each skill as well.