The phrase "are beyond the purview of" is correct and usable in written English.
It is typically used to indicate that something falls outside the scope or range of authority, responsibility, or concern of a particular subject or entity.
Example: "The issues raised in the meeting are beyond the purview of our department and should be addressed by upper management."
Alternatives: "outside the scope of" or "not within the jurisdiction of".
These are delicate cultural questions that, at the moment, are beyond the purview of the scientists.
It includes taking public stands on some highly charged issues that are beyond the purview of his office, like school taxes and Medicaid fraud.
Agency theory's insistence that corporations (because they are legal fictions) cannot have social responsibilities and that societal problems are beyond the purview of business (and should be left to governments) results in a narrowness of vision that prevents corporate leaders from seeing, let alone acting on, many risks and opportunities.
In doing so, it discloses the ways in which our sense of self, and our political loyalties and attachments, are influenced by unconscious drives and ordered by symbolic structures that are beyond the purview of individual agency.
Virtue and vice, and other aspects of morality, are beyond the purview of demonstrative reasoning, which concerns the relations of resemblance, contrariety, degrees in quality, and proportions in quantity and number (T 462 64).
While prescription drugs are not always identified in death certificate data and 60% of overdose deaths are thought to be related to prescription drugs, drug overdose mortality in this study may include deaths caused by methamphetamine, cocaine, heroin, and other illicit drugs, which are beyond the purview of PDMPs.
When a foreign worker, living frugally, produces the same for less, that is basic economics, the manipulation of which is beyond the purview of a president.
But at least one Republican legislator, James Maisano, said that the Patriot Act was beyond the purview of the board and that the resolution set a dangerous precedent.
Coe stopped short of apologizing to the Syrian government, saying such a statement was beyond the purview of his six-week investigation.
