Ratio’s, conditions, etc. are always supposed to be applied more conservatively as needed, subject to the dive leader’s judgement. That can often shift responsibility from the program itself to the decisions of the individuals involved.
One more option, although no indication it was involved here:
If participants will go on an open water dive, and shallow
water for skills practice is inaccessible, an instructor
conducts the skills session from a boat, dock or other
surface support station by using a descent line, horizontal
bar or platform that is within 2 metres/6 feet of the
surface. The ratio is 1:1 when using the descent line option.