I read on their web page for some more BS.

In explaining why their traps are lossless:

"Gain is a function of element spacing and boom length and not what
constitutes an element. The published gain figures for our products are
dBd, actual measured gain. Antennas which use other forms of trapping such
as linear loading, poor trap copies, baluns or matching devices have
inherit loss. "

So, all these things have inherent loss, but not their traps.

Fact is that GAIN is reduced by LOSS, anywhere and everywhere in the
system, dB for dB. This includes conductor losses, dielectric losses, and
trap losses which they exclude from their definition.

Owen