This is true, but he has also heard many of the TOTL headphones at Tyll's Big Sound 2015 event, to which he brought his own modded SR-007s (which means that he owned them at least since then). If you've read his blog he has a pretty high end speaker system, which he uses in his day job, he has a trained ear which he uses daily in his business, and finally, he uses his own material which he mastered, so he knows better than most what it should sound like - that is an advantage that very few of us have. You don't have to agree with his opinion, but he has better backup for it than most of us here.
OTOH, there's this:
1) the SR-007 Mk II is significantly cheaper than the SR-009, this allows a bigger budget for an amp - good ones include SRX Plus, KGSS Carbon and Blue Hawaii SE.
2) well known recording engineer Bob Katz considers the SR-007 Mk II (with port mod) superior to the SR-009 in tonal balance, see his recent blog post on InnerFidelity, "I have a love affair with my Stax SR-007 Mk2 phones, which I judge to be superior, smoother, more musical and accurate than the expensive SR-009 model."
https://www.innerfidelity.com/category/katzs-corner
He uses a Dynaudio Confidence speakers system as well which is well known for it's smoothness (aka, rolled off details). In general it seems Bob Katz prefers smoother sound vs analytical (LCD-4 vs Utopia for instance).