And yes, they mention after you've apparently chosen someone for intimacy that there might have been something between you, but as I said, they're the inquisitive type just being playful with ideas and thoughts...
Like I said, we can explain and reason things as suits our desires/beliefs.
Here, in your sentence, you say that they will suggest they were interested in the player. I found that all/several of them doing that at once was immersion breaking and de-valued them as characters. You chose to interpret it as inquisitive and playful...as is your right I might add

I'm glad you like it!
However, how many will see it my way and how many your way? I have no idea, tbh. That will be one of the tests of how the romance side of this game will be received when fully released.
As I've said a few times, this potential negativity towards the romance could be avoided by simply letting the romances be more wholly initiated by the player. Maybe not in Astarion's and Lae'zel's case since it suits them, but for the others, I think it would work better.
When I went to Gale after accepting Lae'zel's offer, the last thing I expected was the Mystra loving mage to make a pass at me when all I wanted was a chat over a mug of ale...and then when I politely let Gale down, I didn't escape to go talk to someone else just to have them also express desire for me

I'm very curious to see how later romance-able companions are handled and whether they play hard to get or have stricter standards. I mean, I really didn't feel that my character had behaved towards the companions in such an amazing way as to warrant that much attention from so many. I'd even argue that Lae'zel and Astarion should be the only ones willing to sleep with the pc that early in the game, based on their character. But yeah, I might be in a minority.