I can add rows conveniently using Option+Shift+Up Arrow (insert above) or Option+Shift+Down Arrow(insert below).
Is there a keyboard shortcut to delete the current row?
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As others said, but with correction:
First, follow process from ABOVE
SECOND: Quit System Settings and Numbers app and RELAUNCH. Without relaunch, shortcuts do not work for some reason.
This is for latest Numbers as of May 2019 (version 5.3 - 5989)