Help 1769 slave from London

Hello Group,
I'd appreciate help interpreting this unusual baptismal entry (on right)
from 1769 San Martin Texmelucan, Puebla, image 161.

https://familysearch.org/ark:/61903/3:1:939K-RC9H-C1?mode=g&i=160&wc=M8GF-F29%3A164984201%2C164984202%2C165118201%3Fcc%3D1837906&cc=1837906

It's difficult for me to understand, but I believe this adult Negro slave
from London, England??? is being baptized because they're not sure he was
ever baptized? There is a lot that appears interesting, but unfortunately
I can't make it all out. Thank you so much for your assistance.
Alice Blake