I can confirm that the method works on T14 Gen 1 AMD, NM-C801 with ITE IT5261-VG EC chip. After consulting the boardview file, I found out that the LPC_AD0 to LPC_AD3 pins are accessible through some test points and I used them, so that I did not have to cut open the PCB paint layer. The timing is tedious, but it definitely works and it works really well - even my machine serials are preserved. Thank you for your help on this matter. Thanks to Maxpower3 for his genius method. Boardview is attached below if anyone needs it.
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