hey man, it's okay take a load off
The concept you seem to be missing about a minion swarm build is the huge cost. No BotF or Duelling skills, Idols instead of items and the need to stay within ear shot of reinforcement battles in order to level.
Now without BotF, and at least Banded to kick the game off Snipe is somewhat effective and with Scaled Helm totally spammable.
The mistake people make with Snipe is shooting at someone with BotF, Banded and/or Priests and expecting to be more effective than a mosquito bite.
A minion swarm General often does not even have the benefit of a nearby priest as they are busy suiciding themselves into towers and like it or not minions all have a relatively high cost to get out, even for Erebus as it is a good two creep waves to replenish the army which is a minute of hanging around the frontline with 3 Snipes worth of health and no cash. Then of course a General basically needs to hang by the front lines anyway in order to level.
Much better is to take Hitpoint and Armor items, BotF and rank I Priests as early as possible. Pick up Bite so you can drive DG's off instead of being driven off the frontline then be patient skilling up minions handling all the tanking of towers yourself.
An Erebus that can Bite, tank a tower, regen and priest heal through Snipes with a relatively powerful dps force in his army is a force to be reckoned with and totally not a MINION SWARM build.
Any non stupid Erebus is going to be able to quickly counter your idea. All they have to do is not suicide their monks and keep them near. If they get really desperate, they can spend a small amount of gold to get Banded and be completely safe.
The only way your idea works is if the LE or Oak is stubbornly stupid and refuses to get any armor/HP while being constantly sniped. But having a strategy that counts on your opponent being really really stupid isnt much of a strategy.