The Microinverters are still using something akin to MPPT to get the most out of each panel. Of the maximum power point doesn't require calculating a new tracking tracking point due to very little short delta irradiance changes, it doesn't need to do anything and that means that the output and possibly interference generated from required changes would be very, very minimal.

Also, not driving any inductive loads is kinda cheating since it is grid tied and exporting and not directly handling possibly dirty loads from the local use.