You're absolutely right.
In the case before us, when the bill was created some 25 years ago and the position of ombudsperson was established, the ombudsperson could investigate with respect to more rights. Over time, some rights were removed, even though it was hoped that the 16 rights could be subject to investigation.
However, when the government created this position, it chose to limit to eight the number of rights that could be subject to an ombudsperson's review.
That investigative power is also not a coercive power. It's just a power of recommendation.