It would not surprise me of manipulation, however, I do not think that's necessarily the case. I think the more media attention cryptos gain, the more people want to jump in and make some of that money for themselves.
But manipulation by Goldman Sachs is quite possible as well, the media does like to portray cryptos as "great" then as "better pullout of cryptos now!" It is very weird that they'll praise it day 1 then hate it day 2. When they praise it, people buy... They hate it, people sell because they get scared. Someone is profiting off of the buying, selling, buying back up again surely.