I don't think it is the HCV directly causing the taste bud problem but the liver disease might be. I remember reading somewhere that severe liver damage can cause food to taste bad or have no taste. I seem to recall there is a connection. Sorry I couldn't be more help.
Make sure to see a Hepatologist to manage your stage 4 cirrhosis.
Best of luck
I don't know the medical explanation, but I can say that when the liver is diseased, then things start to taste bitter, even sweet things. I had jaundice a couple of times and had to eat sugar candy which tasted terrible.
You have definitely had big problems to deal with the last few years. I hope you can find a way through them, and can take advantage of the knowledge and advice here.