In Liverpool's position they'd have done well to lock in some 'buy & loan-back' deal by now; be it last summer or this.
Who knows what could change by the time BVB 'officially' put him on the market.
They seem pretty confident. Liverpool with Klopp are a huge pull now, they seem to bide their time in the market rather than rush for a lesser option & it nearly always pays off. I don't think Dortmund would've been interested in any kind of buy & loan back deal with a world cup coming up and the fact he's pushing on every single season.
Probably wouldn't want to announce a sale when Haaland had already left too.