Edit: Also does netflix on the V6 come from the internet queue/profile or the TV one then (If as you say it's separate)
In modem mode the TiVo connects to the router you're using.
Netflix and everything else to and from the TiVo will use the TV service flow. Netflix is quite integrated into the TiVo and people are likely to get upset if their downloads break the TV service through their VM set top.
I've a suspicion it's not separate everywhere yet, though, reading some posts. I'll look into this some more.