From Prior + -ian. <span class="searchmatch">Priorian</span> (comparative more <span class="searchmatch">Priorian</span>, superlative most <span class="searchmatch">Priorian</span>) Of or relating to Arthur Prior (1914–1969), logician and philosopher...
if this is the explanation, if this is how the story ultimately bottoms out, then how is ersatzer presentism any better off than <span class="searchmatch">Priorian</span> presentism....