No, that's incorrect.

Hanteo Charts are a record of individual album sales from approved stores and websites. In other words: “we absolutely know a person bought this and can prove it”. In KPop, Hanteo charts are used more than Gaon for performance stage votes on the network circuit (such as Inkigayo, Show Champion, and so on).

Gaon Charts are shipment sales (how many stores stocked their shelves with the album, did the store place reorders, individual sales from websites, etc.). Almost all sales will count at some point towards Gaon (resales and bootleg copies excluded, of course). Gaon Charts are used more than Hanteo in factoring end of year awards (like Daesangs). This is because Gaon shows continuation of popularity and interest.

Because Gaon includes store sales as well as individual, Gaon numbers will always be higher than Hanteo

IZONE's album was released on Apr 1, 2019 tho. While BP's physical album was released on Apr 23, later than the digital release. And the gap between the 2 albums is not much. Considering the time gap on the release, they're both doing well. And why is it a flop, when they're the best-selling artist in YG this year and also on top 5 of the best-selling group so far this year. 

Stream Astro! Stream All Night!