maratikus

If you’re making investment decisions (and trading is very short term investment), then it qualifies.  Investments that are speculative tend to be high risk, but as long as you have some kind of positive return expectation and you thinking about the balance between risk and reward, it’s investment.
Note that CFAI doesn’t require you to have successful work experience in the industry.  You could work for four years at a fund that lost money every day and contributed horrible decisions, but the work experience would almost certainly count (hopefully after completing the curriculum, you would have some ideas about why those decisions were horrible or what went wrong).