According to Troy Hunt this alleged leak is mostly from older leaks and fake data:
"this data is a combination of information sourced from public LinkedIn profiles, fabricated emails address and in part (anecdotally based on simply eyeballing the data this is a small part), the other sources in the column headings above. But the people are real, the companies are real, the domains are real and in many cases, the email addresses themselves are real"
According to Troy Hunt this alleged leak is mostly from older leaks and fake data:
"this data is a combination of information sourced from public LinkedIn profiles, fabricated emails address and in part (anecdotally based on simply eyeballing the data this is a small part), the other sources in the column headings above. But the people are real, the companies are real, the domains are real and in many cases, the email addresses themselves are real"
Source: https://www.troyhunt.com/hackers-scrapers-fakers-whats-really-inside-the-latest-linkedin-dataset/