I think the plastic buckle he's referring to is the one in your photo.
I'm thinking that was in relation to these new clips mentioned earlier in the thread. (below)
If the Snap Clips on this teric strap come off then I have bigger issues to worry about as they are basically identical to the clips on my integrated weights, BP+Wing harness, etc. That is a robust and time-tested fastener that is not likely to fail.