To be honest, the more I think on it, the more I wonder if some third parties are just excited by the possibility of being able to have their games on portable devices with (presumably) enough oomph to back it up. TakeTwo would be acutely aware of the significance of this, given their troubles with the Borderlands 2 port for PSVita. Thus if the Switch provides a portable that is powerful enough for their needs, even if still needing a downgrade from XBO/PS4 graphics, then yeah I could imagine them being receptive to it.
Or of course it could be PR talk and initial hype, but that won't pan out as the Switch is actually out on the market for a few years. We'll see.