As a side note, you'll notice that the chart specifically references the 300M race.

RCV maintains the 300M race in their design: This axle set upgrades the weak 27 splines at the CV to a 300M 30 spline race eliminating the need to neck down the shaft.

http://www.rcvperformance.com/product-details.aspx?sku=CVJ2851-PU

The TG version uses chromoly: The internals of our Longfield™ birfields are made out of 4340 chromoly steel and heat-treated for superior strength.

https://www.trail-gear.com/TG/Longfield_Birfield__30_Spline_Chromoly/i_0_0_4948/_303397-1-KIT.aspx#.V1HRczZf3xg

I would love to see this test run again comparing RCV and TG.  Really, the chart shows the result for RCV (original Longfield design), we just don't know how the new TG version compares.