with a HIFIMAN DEVA Pro you have to have a good ear to feel the audio loss between the cable and the BT dongle, this one supports LDAC and APTx, we are moving away from consumer headphones but more and more high-performance models support Aptx and are not ridiculous in BT and allow a freedom that cable does not offer.
Afterwards, it's just a warning for people who have invested in a headset at 300€ and +, not a purchase advice for a qualcomm Rog6
I don't see how it's relevant, the aptx codecs are a clear stepdown vs the LDAC codec. The only codec that can be considered (even tho some might debate that) high res is LDAC at 990kbs mode.
Even with LDAC, which is notably better than aptx-HD, the bluetooth compression is quite clear, if you think it's hard to hear the difference, then you're absolutely not using a proper amp. I don't think an audiophile will stay long on bluetooth, not only that but the bluetooth module is quite bad itself, the range is awful.
Personally I wouldn't really call those headphones audiophile grade, I find them a little to close to mainstream headphones.
They lack soundstage, which in my opinion is the most important, maybe I have this attitude because of my senheiser which spoiled me to no end, but open backed headphones with a rather small soundstage is a big nono. The boosted mids and treble really makes it hard for me to use as well, since I'm all for balanced sound or a more warm profile, I find them quite fatiguing to use.
Also from what I heard it doesnt scale well with high end AMP's either, which makes sense due to its specs, so I would even debate if the example you posted even constitudes as audiophile grade headphones, then again, at their price point I wouldnt exacly expect greatness either so it's within my expectations. It's not fair comparing my BTR5 + sennheiser setup to 250USD BT headphones, anyways, aptx is not an option for audiophiles, it's inferior to LDAC and is again, not really supported on a whole lot of headphones.