"Audiophile" - the fella is a tit - he tried to tell me the HomePod has a perfectly flat frequency response. Even £10,000 studio monitors don't have a perfectly flat frequency response - further more the HomePod wasn't designed to have one.
His actual graphs show anything but perfectly flat, they show huge peaks and troughs everywhere - which is fine, it's a consumer hifi product and Apple haven't designed it to be flat, they've used every trick in the book to get big sound from a small speaker and to make it sound "wow" when you first play something through it "how is that bass coming from this" - the woofer is plenty big enough to get good bass, but they've gone for psycho-acoustic processing as well to make it even bigger.
To be honest this sort of sound is going to work well for most people, it's the sound signature they're used to. The way sound is presented only starts to change if you listen on studio monitors which are designed to be neutral flat and revealing - many people may find that sound "boring" or overly "clinical" compared to a HomePod type sound though. But when you get into the £300+ headphone market that is what they try to do as well, the £1000 Sennheiser HD-800's are more or less as flat as you can get in a headphone. The idea being to just present the music in as much detail as possible as it was from the studio without applying any sort of EQ curve or enhancement to it in anyway.
But it's a bit like getting a high end TV calibrated - some people watch with the shop "vivid" mode on their TV and some people want a perfectly calibrated TV. Many people would think the calibrated one looks flat, boring and too yellow, yet it's the accurate representation of what the original picture is. Horses for courses - depends if you want hyped or accurate, you can't have both.
The HomePod is a perfectly good "hyped" speaker, but it is anything but revealing, clear, detailed, open, transparent, flat, bright or even top end hi-fi. It does however sound better than 90% of the stuff most people will have heard or bought before, which is all Apple needed to do (and yes it destros the entire Echo range and easily puts Sonos to shame, not that i'd ever want to listen to either for extended periods)
Um . . . that's pretty freakin' flat, even for a very high-end speaker. Have you ever actually looked at frequency measurements before? Certainly not "huge peaks and troughs everywhere". LOL.