Could KB faucet connect to PVC tubing instead of copper lines?

Yes, most of the faucets can be installed.

You will need to properly attach the appropriate adapters, see below.

Once attached, you can connect them onto PVC tubing.

For 1/2" PVC / Female Adapter SLIP x FPT - https://www.plumbingsupplynow.com/1-2-pvc-schedule-40-female-adapter-slip-x-fpt-435005?utm_source=bing&utm_medium=cpc&utm_campaign=**LP%20Bing%20Shopping%20All%20Products&utm_term=4574861726366154&utm_content=Catch%20All

For 1/2 in Brass Nipple Fitting Adapter - https://www.homedepot.com/p/Everbilt-1-2-in-x-Close-MIP-Brass-Nipple-Fitting-802679/207176628

For 1/2" X 2" PVC Nipple - https://pvcpipesupplies.com/1-2-x-2-schedule-80-pvc-nipple-205-020.html