2018 Silverado 4.3L - error code P2227

[M.Spain]

I've got the FIXD gadget and it's telling me the most common fix for this is to replace the mass airflow sensor, which looks pretty easy.

I'm confused because I can't seem to find any videos relating THAT particular replacement to THAT error code (P2227).  Most show error code P2228.

Anyone have this issue before and what did you do?  Thanks in advance.