"Most precious person" is usually CLAMP code for love, so I'd say Sakura definitely loved clone!Syaoran before he lost his heart (I think what Tatasenko meant was that neither of the Syaorans we have now - Real or Soulless Clone - is in love with Sakura).
Oh, I know it means love. It's just that quite a few people only acknowledge it if it's bluntly stated that they "love" them, sadly.
The whole incident reminds me of what happened to Subaru in Tokyo Babylon though. The second he figures out that he loves Seishirou...BAM...finds out he's not who he thought he was. I think Sakura can love the clone regardless if his heart comes back or not (which I think it will), which leads me back to Subaru. After what Seishirou did (which is far worse than what C!Syaoran did), he still loved him and couldn't erase him from his heart.
Sakura and Subaru are very similar in a lot of ways, and I think that their hearts are also similar. She'll love C!Syaoran despite what he does or becomes, she's incapable of hate. Although I'd definately prefer for him to revert back to his old kind self and be with her, Sakura with a mindless killing machine doesn't sound right.