Interesting analysis, and I agree that Atheist were innovative, but all the rest is debatable, and is clearly an attempt to validate the band's music merely for being among the pioneers who have released their albums during the formative years of the genre.
Now, this may be a stretch, but I imagine that had Unquestionbable Presence been released in the late 90s, no one* ( I stand corrected, no Hessian-- is that what you call yourself?)would have given it the props that it received. I find that it bears a lot of the sound characteristics for which most technical death metal nowadays is written off by purists as soulless trash.