Annoyingly the Node Editor never shows all attributes in “Full Mode”. One has to right-click the node and select “Show All Attributes” from the context menu.

Or bind this to a key:

# Bind this to a key to truly show all attributes (and then probably search for the correct one because there are so many :))
from maya import cmds
cmds.nodeEditor('nodeEditorPanel1NodeEditorEd', showAllNodeAttributes='', e=True)
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