I do concede that this is a case where I'm not meeting the expectations of readers with the rest of the story that I give them at the beginning; I'm okay with that.
Nope, this isn't what it is. Part of the point is you not meeting the expectations of readers, but giving them something else instead. What I'm saying is that you're not giving them something else instead, at least not enough or in the right way.
A very character-driven tale where the destruction of our homeworld is treated so insignificantly spoke to me really strongly.
That's just it, though. This is a really good idea. It also isn't what you gave us. You still have a giant text wall of a paragraph going through the boring details that we didn't need to hear, and too little connection of the insignificance of the world's destruction to the way the narrator feels about it.
Why give us all those boring details, especially if you don't even find them significant? Why not contrast them with snippets of interesting and/or totally alien stuff (that the narrator may disapprove of) that the Foundation is focusing on? Why not present the attitudes of people towards Earth in a more interesting fashion? Or Reichardt's feelings about all that info-dumping you did? [Besides the last sentence, these are just suggestions. Re: last sentence, see more below]
In other words: your story content still has to be interesting. What you're dealing in is basically negative space, to steal an art metaphor; the 'positive' space, the concept of 'Earth is an SCP which is being decommed', doesn't have to be some balls-out-weird thing or anything more than that. But the 'negative' space, the space around the concept of 'Earth is an SCP which is being decommed', still should be interesting.
Likely the easiest way to fix this would be to cut out many of the details you do give us about Earth, and put more of Reichardt's POV in that section. (His POV should've been more present in there regardless, but in this case it should help get you further towards your thematic point.)