Torah Temimah cites Menachos.
“For it is a chatas” — all menachos that were taken (kemitzah) with wrong intent remain valid (though not for the owner’s obligation), except the sinner’s minchah, which is invalid.
Diyuk of “hi” requiring correct designation — minchat chotei is invalidated by she-lo lishmah.
Minchat chotei is treated like a chatas: she-lo lishmah at kemitzah disqualifies it entirely. The identification of this flour as “chatas” imports the stricter intention rules that govern animal chatas offerings.