I’m guessing its not your expression, so I’m going to feel free to critise it for poor style choice for variables names 😜
But the top line _column looks like its the variable you want to change.
Personally, I think the safest option here is to add a slider (hit ENTER and rename it to “Column Slider” to your layer and then use this version of the expression:
var column = praeInt(effect("Column Slider")("Slider"));
var row = time*30;
var sliderValue = footage(“Stats.csv”).dataValue([column,row])
Then you can set the column to 0, 1, 2 etc…