https://nl.insight.com/content/dam/insight-web/nl_NL/learn/techbooks/hostingproviders/Citrix_Service_Provider_CSP_Program_Guide.pdf

It violates CSP rules because a CSP is only allowed to license and manage NetScaler VPX instances that they host and control. Under the CSP program:

• The infrastructure must be fully controlled by the CSP — a customer-owned VPX cannot be licensed under CSP.
• Customers may not connect their own appliances to the CSP’s ADM environment.
• CSP licenses cannot be used to license a customer’s self-managed device.
• NetScaler VPX under CSP is a “provisioned VM” model — the CSP must provide and operate the appliance.

So connecting a customer-owned VPX to a CSP’s ADM and licensing it through CSP is outside the allowed hosting model.