Hello Donna,
Yes, I think it is another mistake in the IGI.
The entry I put up was from family search, it doesn't have a photo yet, but the Marriage to Isabel Moore has a photo available.
This is the entry off Familysearch.
Name: Thomas Looney.
Gender: Male.
Christening Date: 14 Aug 1748.
Christening Place: Maughold.
Father's Name: John Looney.
Indexing Project (Batch) Number: C03817-1 ,
System Origin: Isle_Of_Man-ODM ,
GS Film number: 106735.
Averil