While I don't know what "true" represents in this context, it might be related to dealing with multiple products with different values....
Let's say that I purchase 2 products...
The first one has "true", and the second one does not... in that case, would I not see different values? On the standard attribution model, I would see the revenue only from the first product (the one that actually has "true" set), but not the see the revenue for the second product (where true was not set).
In the Linear attribution, wouldn't the value of "true" be carried forward to the second product and therefore I would start seeing the revenue from both?