Hi OT,
This particular airrfame and engine combination had not had this issue prior to this event - the two had made it through icing tests some years ago and got type certification from FAA and EASA (et al). No doubt testing for this condition will be (should be) added to new Type certification tests.
This icing apparently occurred due to a lack of normal fuel-flow variations and a stagnation of unheated fuel in cold pipes, causing fuel waxing. When the waxed fuel did move, it then clogged the heater matrix and caused fuel starvation.
Strange how more, similar, events were only reported afterwards?
But your right, it is the same fuel waxing issue as you were told about in the 60's - That's progress and the modern digital age for you!
Rigga