What is quality? There are multiple definitions. In general, it is a level of satisfaction by conformance to expectations, both implicit and explicit, by all stakeholders.
It is a common thing that a lot of changes are introduced during the project development. New requirements are uncovered, both functional (new features) and non-functional (e.g. accessibility, performance or localization requirements).
Later, as the project evolves, the project goals may change. The basic test strategy and approach should be updated along with the project evolution.