Welcome to Manjaro Forum
I found the other discussion you mentioned - Microphone on Lenovo Yoga C930 not working
SOF Firmware support for the digital microphone array should be working now
The bug report for Kabylake support has been closed, and another bug about C930/C940 laptops has also been closed
[BUG] Fedora 31 (kernel 5.4.7) SOF firmware load fails on Yoga C940 (i7-1065G7 Ice Lake) · Issue #2264 · thesofproject/sof · GitHub
You should be able to remove the modprobe option and have microphone working with sof-firmware driver
(but it may be better to comment it out with a ‘#’ in case you need it back)
The speaker issue has not been resolved yet so the workaround suggested in the previous post is the only other option for now
GitHub - droserasprout/lenovo-yoga-c930-linux: Varions fixes to provide full hardware support of Lenovo Yoga C930 on Linux
But there is another bug report about the speakers
https://bugzilla.kernel.org/show_bug.cgi?id=203409