I had to remove a nem that hid in the back of my tank. I aimed the return straight at it and tossed him around pretty good. Next morning, he was completely moved. I def wouldn't say this option is a myth. If a nem is getting too much flow, it will absolutely try to reposition to stop getting tossed. I'm not saying hit him with a tornado of water but just make the flow a little more than he wants to handle on a daily basis.
One other option that worked for me was slowly sliding a credit card under it's foot (if you can reach) I did this very slowly for a 5" foot and it took about 45 minutes of slow progress. They're pretty hardy but it's like super glue under there. This method did cause some stress and he took about 24 hours to fully open up again.
You can also try putting an umbrella above him. Not an actual umbrella

but block its light. The nem will hopefully realize he is not getting proper light and adjust position to find the light.