MtG is in fact turn-based. This is perfectly illustrated by the concept of passing priority in Magic, and the use of the stack. Even though you can act within the other player's "turn", there is a granularity there at the passing priority level. The entire game revolves around one player making a decision and then the other in strictly defined procession. This is different to real-time gameplay which is traditionally defined in terms of not having to wait for your turn.
What cipher_nemo seems to want is a system where moves are instantly communicated and appear on your screen when they are made, as opposed to being saved up until the end of the turn. This is more "real time" than the current system, but in a different sense to the game mechanic.
What Zanzarino means by "real time" should probably be taken in context as being opposed to the t50 system, which he considers to be PVP. What he presumably means is players playing against each other directly, not by proxy through an AI.