Do you really think the big AMD vendors don't have access to AMDs proprietary in-house BIOS dev tools, and need to copy straps from some guy on forums? (FYI the Stilt had/has access to the same tools).
And with tools you also need brains to use it.
I do not exclude such possibility.
Given that there are some
stock bioses which copy timings to higher straps and
that Stilt said vendors do lazy optimization job.
Of cause it may be because vendors and Stilt both had access to good stuff.
I am to lazy to do digging and will not put money on either case.
For the sake of optimization it is irrelevant 'who changed after who', only changed values is relevant.