I dont even know where he gets 2-5m from. All i can find on DOS2 sales is that it broke 1m sales in late 2017 that is all. If we're being generous and say DOS2 has sold 2m copies then DA:O has outsold DOS1+2 combined which means RTwP sells better than TB confirmed? Atleast by his logic.
"Late 2017" was November 2017, one month and something after it launched. These are also numbers exclusive to the PC version, which was at the time the only one available. The game also sold steadily for a while, had a Definitive edition, a console launch and what's most important Larian games typically take a long time to go on sale for the first time... and it's never a heavy discount anyway.
We have just rough estimations and news to refer to, but I remember when at some point DA:O was estimated barely south of the two million copies across all platforms. I'd bet you that on the long term DOS 2 outsold it.
On a side note it's worth stressing that DA:O was basically a different game on console, because RTWP is basically unmarketable there, so they turned it in a third person action game.
I can also remember my surprise when I learned that despise all Bioware's efforts to make it more palatable "for the mass market" DA2 didn't outsold the first. Not sure about Inquisition, on the other hand.
EDIT - Barely related note, but: man, I tried to reinstall and play DA:O barely few days ago and it was ROUGH going back to it.
It's almost amusing that for how shallow it actually was, this was once what I considered the king of "production value" for party-based RPGS.
