I think he is referring to the general sentiment that profession bounty hunters dump their coins and tokens immediately, sometimes causing the coin price to sink below the ICO price.  That may often be the case, but if the project was worth investing in the first place, don't worry about it.  From what I've seen, ICOs normally pay the buyers a few days before the bounty hunters, so if they have doubts about the project, they can always get out before the bounty hunters.  

But I wouldn't invest in a project that I didn't have long term faith in, so I couldn't care less if bounty hunters dump.  IMO, it will be their loss in the long run.