Just to follow up with my previous answer...
I have updated linux-next to the 5.7.4-1 and it remains the exact same outputs for xinput, dmesg and lsmod as I posted before for 5.7.2-1. The touchpad still not recognizable by KaOS.

14 days later

demm
I replied to your questions above.
And have tried every single new linux-next available with the same (dmesg and xinput and other) outputs as posted before. Currently in 5.7.7-1-next with TouchPad not recognized.

Do you have any update about this issue? or something I can do to help you solving this?

No updates, distros I found were the issue is also present, nothing has changed there either. (one even linked to this thread for new things to try).

17 days later

lenovo x1c7 slackware
touchpad not detected
in systemrescue, touchpad is working
serio module with psmouse dependent?
there is I2C-SYNA8004 serial

6 months later

Hey I tried KaOs Today 10 Jan 2021 ( in Live mode)
Touchpad is still not working
So I used kdeconnect-cli to emulate remote input via Android device and got these logs

JournalCtl output
https://pastebin.com/cbVgJEmy

libinput devices output
https://pastebin.com/4Xkhz98s

rmmod output
https://pastebin.com/GRX2EXNr

Finally hwinfo
https://pastebin.com/KB02t8bT

Output of commands that other user tried
https://pastebin.com/VNT664c1

Finally to add
1)This touchpad works on
Ubuntu , Linux Mint ,KDE Neon ,Manjaro ,Endeavour ,openSUSE and Windows
2)And does not works on
KaOs and Debian Stable
3)
KaOs install even fails to show graphical interface so for that created a new issue

    2 years later

    I have the same issue with a Huawei matebook, my touchpad doesn't recognize in live and installed

    demm locked the discussion .