Hi Vinny
Inline injection pumps like these are lubricated by the engine's pressurised lubrication system ..... So in that respect - the answer is "Yes".
But where they have a pneumatic governor, some oil leaks through the "rack seal" over time and accumulates on the pump-side of the leather diaphragm. And since engine oil damages leather, Toyota installed a drain plug there to enable this leaked-oil to be periodically drained.
Actually your question makes me recall a dilemna I had when I bought my cruiser back in 1981. .... The owners manual mistakenly lists "changing the IP oil" as part of periodic maintenance (and I am a stickler for proper maintenance). I recall going to the trouble of asking local Toyota mechanics how to accomplish this task ... But of course they just smiled and offered no help because assisting someone who does his own repairs/maintenance is/was "against their best interests". It actually took me quite some time to conclude that this item in the maintenance schedule was nonsense .