The turkish part in the headline isn’t supported by the article. What the article says is they are related to people who used to live in what’s now Turkey, not turkish people.
This fits in with the Black Sea area being the first to have settled agriculture and domesticated animals. After the Black Sea flooded around 8K years ago the people of the area spread out through the world, these people often referred to as neolithic farmers. 90% of Greeks are related to these people, 60% of Italians. The rest of Europe has lower numbers, going down to 10% in Scandinavia. You can guess the percentage by asking yourself how much that European ethnic group looks like Greek people.