Huh, you are absolutely right, my MT7961 is M.2 too. I too have swapped my SSD but I guess I didn't look at the WiFi chip at the time because I "knew" it was soldered.
I was originally looking to buy one of the X13 Gen 2 Intel models that have it soldered, I must've thought it applied to AMD as well.
I guess I'll try out Intel AX210 then, to see which one actually works better for me.
According to the hardware maintenance manual: "Wireless LAN card (for selected AMD models)" [1]
I can confirm from the internal photos I have of my X13 AMD Gen 2 (I swapped the stock SSD for a SK Hynix P31 Gold 1TB) that the WiFi is indeed M.2 socketed.
[1] https://download.lenovo.com/pccbbs/mobiles_pdf/t14s_gen2_x13...