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You don't see the point. If you think about it the coach was probably typing strategies all game to T1 but he slipped up and typed in all chat. The DQ would be the strictest and riskiest option while doing something like what they did in the ACEND vs VK game would be the safest. IMO they should've done something like what they did in the ACEND vs VK game.
now youre just saying things with no proof... we don't know what else he typed. saying t1 coach could have been typing strategies all game is like saying tsm coach could have been typing strategies all game, we would have no knowledge either way.
i agree though, the rule was broken so the map should be replayed or forfeited at worst. a series forfeit seems extreme