First off, we share about 98 percent of our DNA with chimps, so there is definitely some sort of relationship. Secondly, no one said we evolved from chimps. Humans and chimps evolved from a common ancestor, splitting about 5 million years ago. Thirdly, there is nothing to say a parent and daughter species cannot exist at the same time.
Statements like this always make me chuckle. Like they know that an event occurred 5,000,000 years ago. LOL. Until another scientist proves them wrong in the future they cling to this b.s. The agenda driven pseudo scientists are out in force when it comes to this issue. But they forget to tell you that human and cat DNA is about 90% similar. In tracing the origin of a life form, DNA can no more be used as the final word than a Democrat's lips can be used for telling the truth. Notice they don't dare use the word "proof" when they talk about human and chimp DNA, they use the word "evidence", which means nothing in true science. True science deals in proof, not "evidence", and they still cannot prove humans evolved from chimps any better than they could when they placed human teeth in a gorilla skull and called it "Piltdown man". lol. They need to stop presenting this theoretical crap as though it were fact.
By the way there was a story out on the tabloid ether some years ago that the Chinese had hybridized humans and chimps. Drove me bananas. The Chicom were obviously trying to panda to my lowest common denominator
So it is presumed.