Surely for that parallel to hold out the thread would have to be an absolute work of art... but he doesn't tell anyone about it and no-one cares because they just want to see the numbers?
Careful, he notes in the tweet that these weekly sales are not aligned with the weekly sales charts, as those 2700 actually cover 15th to 21st. Comparison number for Conception should still be pretty close though.
When we compare OreImo and P2EP with these 2700 then they should both have sold less than 2700 digitally as the games rank OreHata > OreImo > P2EP in the PSN store.