Influencers are very important to a project, influencers are a marketing strategy so it's only natural that the coins / tokens promoted by them price will pump.
This is not true. I don't know how important influencers can be to a project, most of this people you call influencers or experts are only but (paid) shills and nothing more, they can't determine a projects success or failure and Investors shouldn't invest in a project cause this or that Influencer made comments about the project, at most it could be a pump and dump project and the influencers would be around during the pump, but soon when the coin dumps, the investors are left alone, with their losses.
I don't trust influencers or anyone who receives payments to talk about a project or give trading advice and other whatnots, in cryptocurrency, you must learn to do your research yourself, trust your discretion alone, cause you're the one bearing the risk in the end, and the profits as well.