The practice that he's doing for being consistent will help him reach that goal of being successful as a bitcoin investor. Tons of stories have been there that proves DCA is the key and it's not regarding the status of the person who does it. Whether you're a student or an employed or unemployed person but with savings, it's always worth it for those who are trying and risking it. But those that don't, they may have no loss at all but for sure, they also have no gain.
For sure, I agree that DCA investment can pay off quite stupendously, yet if someone is investing $10 per month into bitcoin, it could still take them 30 to 40 years to reach some kind of a meaningful level of investment.. even though I had already shown the example above that investing $10 per month starting 9 years ago would have gotten a person to nearly 1 bitcoin currently, and surely 1 bitcoin is likely going to be a decent amount of value in the coming 5-20 years, so such a person will likely not need to invest more than $10 per month into bitcoin if s/he had started investing in bitcoin 9 years ago.
On the other hand, if a person is starting to invest into bitcoin right now, I would think that it would be better to be more aggressive than $10 per month, and perhaps $100 per week would be a good target, but a student might not be able to invest that much and surely with $10 per month, OP might well be investing as aggressively as he is able to during these times that he is a student.
I agree with what you've said, $10 investing right now isn't going to have that impact but at least for the sake of DCA and investing, can't deny that a student has it prepared for the bigger portion that s/he may do in the near future. Maybe after graduation and being employed, that student turning himself into an employee already have that idea that the bigger investment and amount that's being put in DCA, the potential is bigger for the returns to come.