They were always expected to, their stance hasnt changed at all.
5 weeks ago they weren't (table before our 2nd leg vs them):
To now:
Things have definitely changed, not just for Dortmund but for Haaland too. He's a young striker breaking Champions League records, so being out of the Champions League wasn't an option for him. Now they're safe he doesn't have to force a move, in fact he can do 1 more year in the Champions League at Dortmund and then command a huge wage next season when there's a bidding war for him.
As it stands with Haaland seemingly off the table, Kane makes sense, wants to come and would genuinely be great in our side, plus Pep obviously likes him.