Reading into this a bit more.
I can get the row object from my cell object by calling cell.getRow()
HOWEVER,
row.getIndex() returns None. The index is default to the id parameter passed into the table when the data is read, but can be overwritten by when instantiating the Tabulator Object with the argument index : <put in your id string here>
This argument is used in the Tabulator app (This is my tweaked version from here the anvil-tabulator post)
https://anvil.works/build#clone:LGFVYBV6AAFTQIFQ=VTBVLOVD7KMKFZL6FL4CJ2ZG
it is defined as self._index which I believe is an attribute divided in the anvil.js.window.Tabulator Class but I am not sure how use it.