Up to now I didn't encounter any problems on server with described method, tested it with some other guys. Even if one of us was at the other side of the map while the other one damaged the vehicle to trigger the next armoreffect: When the other one returned he always could see the proper damagestate model. Perhaps because it is no effect per se, but rather a simpleobject? Real effects/emitters are more tricky and tend to cause problems on long range, that's true.
This tutorial does not describe or use emitters, actually it doesn't even use effects per definition.
It only uses the armoreffect command to include simpleobjects, as armoreffect allows spawning pretty much any object type
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