mp4box -raw 1 "%path%" -out "\some temp folder\%filename%.aac"
mp4box -add "%filename%.aac" "%filename%.m4a"
(I believe) He means renaming the file so that the desired metadata (tags) can be derived from the filename using "Automatically Fill Values" once the AAC data has been re-boxed within an MPEG-4 container.
To me, it seems like a sound idea, and I've done something similar myself. I suggest using the YAMB frontend.
But to further assist the OP we will need to know what "act strangely"means.