Fed Fund Rate vs 30YT since 1970(only cherry picking this year because the data on fred is poor before this period, and end of gold standard is significant) is a perfect 8/8[0].
And how many degrees of freedom went into the choice of metrics to compare? Just because something went 8/8 doesn't mean it will predict the future crashes.
[0]: https://fred.stlouisfed.org/graph/?g=ENDs