The role of aspirin in this stack has been highly debated, and there is no clear evidence that it is crucial to include aspirin in this stack. Using this much aspirin can pose certain health issues, so some people will just run this stack without aspirin.
However, in any case this stack is not a healthy way of losing fat. Stims are not meant for fat loss, and they will only lead to short term fat loss. Besides, using that much stims will also increase your cortisol - the hormone of stress, which is notoriously good at eating up your muscle mass. So you will end up losing a good chunk of lean mass as well.
Instead, better consider using Cardarine GW or SR9009 - these PPAR modulators will not cause any side effects, and yet they will lead to a very effective and long lasting fat loss. Just make sure to be using the real ones, as many fakes are sold these days. Personally I get mine from sarms1.com , and in over two years I did not have a single issue with them.