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I just looked at the source (slave schedule) and the image for the source and I don't see where it says they are Mexican. Could it be that in the Color column the letter B represents black and the M for mulatto and not Mexican?
Later edit: It seems the slave schedule on FamilySearch was indexed incorrectly. According to the 1850 instructions to enumerators, the letter "M" represents "mulatto" and not Mexican. See: 1 - 1850 Census Instructions to Enumerators (census.gov) 2 - 1850 Census Instructions (PDF)
"6. Under heading 6, entitled ‘‘Color,’’ in all cases where the person is white, leave the space blank; in all cases where the person is black, insert the letter B; if mulatto, insert M. It is very desirable that these particulars be carefully regarded."