QB Issue Resolution:

inactive does not mean deleted, it just gets them off some lists, other lists and reports still show them

you can not inactivate items by customer

Resolution for Issue 'why do inactive inventory items show up on price level lists?' available: Yes (Solved).
Source: Intuit Community forum.

why do inactive inventory items show up on price level lists?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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