These are metaphorical snapshots based on how Gulenko believes each dual couple theoretically relates to one another.

Gulenko also labeled IEI/EIE as trophies/challengers & SLE/LSI as conquerors which, to some, sounds kinda abusive. Cause of that, more accurate imagery may have been too vulgar for some to handle.
However, Gulenko is NO SLE and his symbolic image is just that: his symbolic image.

Whatever reasons he chose for utilizing that particular image would be best explained by Gulenko himself