Nothing strange about this video except that it is very misleading. The CT is in saturation with no load, so he sees the higher amps delivered to the heater in that case.
With a small load on the secondary, the CT is taken out of saturation and the series impedance to the heater increases dropping the amps to the heater slightly.
With the CT out of saturation it is able to act like a normal transformer and transfer some power to the secondary CFL load. The missing amps on the primary now appear on the secondary.
This guy need to understand the nature of transformers in saturation and how a secondary load can pull the transformer out of saturation. This is true for any transformer with a fairly tight magnetic structure with no air gaps that is operated close to or at saturation.
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