From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
LabVIEW 2019 SP1 is an separate package from LabVIEW 2019. Therefore, this would be considered an upgrade rather than an update. However, you're absolutely correct to expect that NIPM should be started rather than NI Update Service.
If you'd like to report this as an official bug, you can create a Service Request ticket with Technical Support here.
The Technical Support Engineers will likely need some additional information in order to replicate your set-up and confirm whether this is definitely a bug.