One factor is the price. But Born Pink is still selling in the US with the ridiculous price while Between 1 & 2 has stopped selling.
But its correct that Twice got the tracking period as advantage. Even with streaming. Blackpink did not release anything in 2021-2022 so Twice will really overtake them. However, after 2 months of dropping Born Pink, Blackpink already overtook Twice with their streams.
Its just the advantage of tracking period that Twice was able to do it.
Anyway, its still undeniable that Twice is starting to do well in the US.