IF they say they're teaching JKD concepts then they MUST be certified by either Dan or Larry etc (the 1st teir of the JKD org).
So, you can be assured you will learn "something" at the very least.
As for the similarities between certain parts of JKD training & WT
In short...yes you will be doing entering to trapping..AKA- jun-fan/modified WT.
As for Savate.....I much prefer MT kicking myself..savate is great for keeping distance, but for "ME"...I find MT way more effective, as I'm aggressive & like to move into elbow or knee range & hopefully go to ground as much as I can.
But that's just me..some/most ppl can use savate way more effectively than I.
Personally..no-one kicks or knees harder than a MT, kyokushin comes a close 2nd.
I use what works for ME!
I won my last fight by 3 fences & 2 backyards !!