The timing of the attacks is certainly a correlation factor, however stations should be viewed as independent targets in the Galaxy and thus can be attacked by alt accounts as independent targets.
However, if he uses his alt accounts to soften your mothership or station, then using another alt account to attack the same station or mothership, that is a breach of the TOS and it will be enforced.
No cameron, he said every station is an independent target. So I could kill 2 stations with account A, 2 stations with account B... etc
But you are not allowed to hit one station with both your alt as your main.