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The export command as I know it is part of tabcmd, not tabadmin (I do see one in the tabadmin documentation for exporting a site, but that doesn't seem like what you are describing). While TSM replaces the tabadmin commands, the functionality of tabcmd is still the same (at least in my experience). The tabcmd export function still exists and I have utilized it in a 2018.2 environment.
Hope this helps,
oh thank goodness I was thinking tabadmin was tabcmd. Phew!!!!!