One google shows that’s considered the “current active user” count, not total sales. 2.3 billion by Jan 2024 (so more now) is the estimate for total sales.
I used a llm to sum your percentages and counted only 785,644,479 people. That's just over half the 1.4B claim.
However, it also linked to articles that showed that as of 2025, there are approximately 1.38 to 1.56 billion active iPhone users worldwide. So the percentages may be misleading but the number is correct.
What are you basing this on, the total number of iPhones sold since 2007? If so, it doesn't account for the users that have bought multiple iPhones.