In reply to Zach.

kid, Strip That Down sold 12,480,000 copies as of 2020. So if Strip That Down was added as the album sales, it would have been more than 12 million.
His album came out in December 2019, so of course, the 2020 increase would not be added into the 2019 charts. Use your brain if you have any,
Unfortunately for you. Liam's 2019 debut album had way more streams than Harry's 2017 debut album until 2021, where harry's became 2.6 billion, and Liam's become 2.5 billion after Harry's fans noticed Harry was 2nd.