That is bad that the HED website has two different max PSI for the same wheel. If you access via “exploring the Vanquish Pro Series” and choosing the disc it shows the 70 psi max reported by @Duncan74. If you choose via shopping disc wheels and choose the Vanquish Pro it shows the 75 max psi reported by @E_DUB.
Additionally, in the Help me choose the best disc wheel thread it was reported by @easyryder that his LBS called HED and “HED confirmed running 80-90 lbs would be no problem”.
For me going over 70 psi would be if I ever raced on course that was classified as “new” per the Silca calculator, but then only need 73.5 psi. As a Vanquish Pro disc owner I would like to know the real answer.
@E_DUB surely Slowtwitch can get an official stance from HED and at the same time alert them of the conflicting details on their website.