Both figures are correct.
The 23Nm is for the M10 threaded part which acts as the banjo bolt. The bleed nipple itself (which screws into the banjo bolt) should be torqued to only 4 Nm, i.e. just nipped up.
The recommended grease is molybdenum disulphide. Always apply grease if the manual shows it otherwise the torque wrench will click before you reach the recommended tightness.
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