Yes. You have correctly summarized the approach I took and the conclusions.
Keep in mind that we lack native precise location info for the moving recorders, and it’s no easy task to determine their positions through video analysis, but a couple of the other forum members did put a lot of time into doing just that and seemed to be quite successful. I’m not planning to conduct any further analysis myself, but I would definitely encourage you to try a variation on my approach to see what you come up with. The data that I used is all archived here: TDOA_v4
And here are some posts I bookmarked that you might find interesting and useful.
@vt1 showing refinements to recorder positions: ref1, ref2 and ref3
@offtheback reports boom time measurements: ref
@offtheback audio analysis wrapup: ref