What he says is not unrealistic, lot's of aircraft had trim tabs that were only adjustable on the ground (the 109 and 190 had it too for the rudder i think).
It's just not particularly useful for the reason you mentioned: trim changes when speed changes.
What they usually did was adjust these trim tabs for an aircraft's cruise speed so that the pilot wouldn't have to "fight" the controls during transit. That's also the default trim value most flight sims use for ground adjustable trim tabs.
The reason people usually have problems with this in flight sims is that they tend to fly faster than the cruise speeds specified for the real aircraft.
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