The old installer had an option to remove all NI Software via the command line:
Automating Uninstallation of NI Software - National Instruments
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019LfWSAU&l=en-US
While the nipk command line interface has the "remove" option there is no "remove all" feature. It is only possible to remove single packages.
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The nipkg.exe help lists the following which supports the ability to remove all packages, see bold text:
nipkg remove [OPTIONS] [PACKAGES]
Uninstalls previously installed package(s).
Use "nipkg remove" to remove all packages except locked and essential
packages and their dependencies.
Use "nipkg remove --force-essential --force-locked" to remove all packages
including locked, essential, and NI Package Manager packages.