Influencers can indeed manipulate the market, but not as much as whales or professional investors...
Influencers with a large following who do not have an investment background or cryptocurrency background have an impact, but the bigger impact is people with high finances, super rich people, or world-class famous investors...they have a big influence on small investors, because they are the ones who control the trend...
However, in the investment world, people with big influence are usually prohibited by the government from tweeting or revealing which stocks they buy... because this has a big influence on market manipulation which is also considered a danger for some people.