default or selected kernelversion does not have config value CONFIG_ZNET.
Result is shown for kernelversion 6.2.5

Zenith Z-Note support (EXPERIMENTAL)

modulename: znet.ko

configname: CONFIG_ZNET

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>Zenith Z-Note support (EXPERIMENTAL)
In linux kernel since version 2.6.12  
The Zenith Z-Note notebook computer has a built-in network
(Ethernet) card, and this is the Linux driver for it. Note that the
IBM Thinkpad 300 is compatible with the Z-Note and is also supported
by this driver. Read the Ethernet-HOWTO, available from

source code: