From his statement you could understand that he has an idea but still got some little misunderstanding concerning how the discretionary fund is generated, atleast he knows that investing on Bitcoin should be done with the discretionary fund which is very important, it's good you brought to his notice that the discretionary can be generated from his salary or a business so when next he's discussing about the discretionary he'll know the appropriate things to say, we learn everyday and I believe he's learnt about that and taken the necessary corrections which is what this thread and the forum in general is all about for those who are here to learn and add to their knowledge about Bitcoin.
Yes of course we keep learning and relearning but it becomes a problem when someone is been corrected without such person taking correction.
Since the peron involved understands how necessary it is to invest in Bitcoin with discretionary income, I believe he will find the several heads up here about how discretionary income came gotten, you know one thing I love about this thread is that once any is lacking in ideas or will I say steps to be taken to be safe without pressure while investing in Bitcoin, several advise and suggest will come up in a shortest interval and before you could know it @JayJuanGee will teach the person with the words that an ordinary man will understand, I keep saying it i learnt many things from @JayJuanGee and those things has been helpful to me, sorry for deviating, let's learn and extends the knowledge to others here and in real life and let's not forget to continue buying and hodling for a long-term which is the main focus.