Setting the SEM filter Gate Sequencer rate to 1/16T (as shown in the display to the bottom right of the plug-in) actually gives 1/8 triplet timing. I've also checked it by bouncing the two settings with the envelope triggering on every division, and checking alignment with the grid.
This is the case for all triplet settings (i.e. they all give a triplet rate of the next longest beat division).
Just thought I would check, and yes, it does the same for the LFO rate when sync'd to clock.
I've checked Software Centre and it's not offering any updates.
SEM Filter version is 1.1.0.389
I'm using Logic X 10.4.4