With kidney kitties if they don't eat the important thing is to get them eating. It's more important than keeping a diet. The diet is to keep the proteine low. But if they lose weight it means they are digesting their own proteine which is just as bad.
When Filou didn't eat we tried everything especially fatty stuff. Filou got liver pate, goose fat and whatever he liked best. I hope you find something Taz really loves.
10,5 lb is low- but not too bad.
Filou at all times loved the Royal canin Renal dry food. Even Tigris who is healhy loves it. So eating dry food is much better than not eating- and of course you should provide plenty of water.
Sending all best wishes to Taz