It's not terrible, but it has several unnecessary stylistic decisions that make legibility harder, including - sticky header as you mention - an unnecessary 3

It's not terrible, but it has several unnecessary stylistic decisions that make legibility harder, including - sticky header as you mention - an unnecessary 3 column layout - switch between light / dark background - FAQ accordion where you have to click to view each answer, which collapses the others. This means to read the entire thing, you have to click >20 times. Content-wise, there's no TL;DR / summary at top which impacts understanding. I still can't find the part of the text that says IBM is preparing for a UK exit from the EU as the title suggests. It's a lot of 'well we believe these things and there's complexity in this'.