"IF" you were worried about a ton of extra premix fuel in the lower end of crankcase, I could see how removing the reeds and bringing piston to top dead could let it air out . And how starting fluid may aid in getting old oil sludge to evaporate or get burned out perhaps ??
Spraying starter fluid in there may help I guess, I'd be worried about leaving reeds off in a shed or drafty garage blowing dust down into motor, so I'd keep it covered with a rag of some sort .
I think the person that told you that didn't explain themselves completely, maybe a blowgun and compressed air after the lower end starting fluid saturation ?
This may be a trick best used under adult supervision.