I take two of the products in abyss (relora and ashwagandha), and although I try to take them on an empty stomach, sometimes it isn't doable because of how little time I have between getting home from the gym/bjj and having to go to sleep. Those two ingredients seem to work fine even when I have food in my stomach (take a little longer to feel and don't have the same kick, but they work). Other ingredients in Abyss might not, though (l-dopa, for instance, doesn't work well at all if you have eaten carbs). If they say take on an empty stomach, then obviously that is ideal. There are so many things in the product that it would definitely still do something if you have eaten, but I don't know if it would be nearly as effective.
My suggestion: try it a few times and see how it works. If possible, post your thoughts in this thread so the info will be here for others to see.