Let's take a step back.
The chapeau of paragraph 718.2(a) basically sets out the aggravating factors. It's found in the section containing sentencing principles. Along with parity, for example, aggravating and mitigating factors are principles that help judges apply the fundamental sentencing principle of proportionality to the gravity of the offence and the degree of responsibility of the offender. As a result, they can determine that certain circumstances are mitigating or aggravating.
It's important to read the rest of the chapeau. Before listing the aggravating circumstances, it says “without limiting the generality of the foregoing.” Basically, I think that this wording is a drafting choice. Parliament undoubtedly decided to list the circumstances in this manner to ensure that they would be considered aggravating in all situations.