That was actually included in the previous wording. Overtime pay did not count towards holiday pay. Currently, overtime is not included, but regular hours are. As previously mentioned, the systems are fairly complex. In addition, I must point out that the legislation is poorly drafted. So it's a bit difficult to make sense of it.
It should also be noted that this provision is based on the current Quebec provisions. The wording we use is very similar to that used in the Act respecting labour standards, which also doesn't provide for overtime pay.