I'll give it a shot. I've never done running translation like this before, so it might be a bit rough. Bear with me. ;) I'll record times from the video in case you want to watch and read along.
"Testing Stax [headphones]. Here is the classic model [points at 307s], the previous flagship, model 007, and the new flagship, model 009. The source is [a brand or model I can't make out], and we have two amplifiers, one solid state and one vacuum tube [he doesn't say what models]. We obviously prefer tubes. But let me try to figure this out: [0:52] what distinguishes the three headphone models: 009, 007, and 307? Everyone knows these [points at 307s], they're Stax classics, but does the new flagship sound 10 times better than the classic model? Because it certainly costs 10 times more. [1:23] Technologically, everything is the same: electrostatic transducers, except these are rectangular [holds up 307s], and these are round [points at 009s]. [shrugs, puts on 307s] Classic Stax sound, incredibly transparent, wide ["large scale"], beautiful, everything is great. Now the 007s [puts them on, 1:41]. [1:53] A bit more detail, there's a certain elegance in the presentation... [1:59] 009s. And here is also space [spreads his arms wide at 2:07], and breath... [2:17] Well guys, if you don't have money for monitors from [some brand I can't make out] or speakers from [another brand; I either have don't know these speaker companies or don't recognize their Russified names], then... you just have to spend the same amount of money on headphones! [fade out and in] It should be obvious that the sound you've been hearing in the video clip has nothing to do with the sound I heard from these headphones. I had to substitute a fake for the video, because I couldn't have recorded from inside my ears... could I?"
One of the comments on the video points out that the guy in the video seems to have worn the 009s backwards. Which means they should have been uncomfortable and didn't seal properly.
The accompanying article only discusses the 007s. Very little new information here. The author basically loves them, and spends most of the text explaining how electrostatic transducers work, and notes a bit about their history. Notes that conventional headphones he used to love don't sound so great anymore, not after listening to Stax. He also talks about the measurements, noting that treble fall-off in the FR chart (NB: I didn't look for any other measurements of 007s to see if the graphs look reasonable), but says he doesn't really feel it. (Which surprises me: my brief time with 007s made me think they're rather dark, compared to 009s and SR-Omegas.)
The source is a Wadia. Unfortunately the measurements in that article are utter crap; it's not just that they contradict all of the other 009 measurements, which they do, it's that they didn't even bother to use the proper settings. See the weird smoothing on the frequency response and the accompanying poor capture of the impulse response.