There's plenty more BS in that PDF too. Let's take a few samples.
"The 3.5 TRRS is not an industry standard. And for not so well-designed amplifiers, plugging in a TRS 3.5 will burn out the 3.5TRRS balanced amp!"
Implying theirs is a poor design. Regardless of the connector, not making the output short-circuit proof is unforgivable.
"When it comes to D/A converter chips, we go all out. Our hip-dac’s heart is the very same as in many of our pricier products – a custom- programmed Texas Instruments Burr-Brown DSD1793."
If going "all out," why not use the better performing PCM1792A chip? And do they really expect us to believe they had a "custom-programmed" version of the chip made? Maybe what they actually mean is that they change (program) some settings from the power-on defaults of the chip.
"In the hip-dac, the clock domain naturally covers USB but also synchronizes the MCU (Master Control Unit) to effectively ensure the hip-dac’s entire digital functionality is slaved to the GMT clock system. It is global by name and by nature."
The clocks are decent, but that "global" nonsense is just that. The USB interface requires a multiple of 12 MHz while the DAC runs at a multiple of 11.2896 MHz or 12.288 MHz. It is of course possible to synthesise the USB clock from the audio clock using a fractional PLL, but there'd be no benefit whatsoever from doing that. The clock domain crossings still have to handle arbitrary phase differences. Oh, and the iFi DACs I've looked inside do have a separate 24 MHz crystal beside the XMOS processor.
"iFi audio’s proprietary high-performance, low-noise, quad J-Fet OV4627A operational amplifiers"
That chip designation doesn't seem to exist outside of iFi marketing blurbs. I'm guessing it means they've renamed a stock product to make it harder for people to look up the datasheet.
"Running alongside the Burr-Brown ‘True Native’ chipset is the 8-Core XMOS based on our own code, which updates it with our own Star Clocking, just as it was done in the micro iDSD."
Wow, they wrote some software. Very impressive. Wonder if they put as much effort into that as they did with the promotional materials.
"The hip-dac implements Version 4 AMR XMOS platform and uses the latest generation 8-Core 500MIPS XMOS1 transputer derived main processor. These processors are quite unique in their architecture and based on a technology once considered to revolutionize computing, the INMOS Transputer."
A slight correction is in order. The transputer designers hoped it would revolutionise computing. It didn't, instead fading into obscurity. Some of the broader design ideas were interesting enough that they show up now and again in specialised applications. As for the XMOS chip, it strikes me as annoying more than anything else. Besides, the architecture of the microcontroller really doesn't matter at all, provided it can shuffle bits from the USB port to the DAC in a timely manner.
"TDK high stability C0G surface mounted capacitors - C0G dielectric close to Teflon in key areas that affect the smoothest sonics."
C0G offers good temperature stability, and the capacitance has little voltage dependency. These properties make it the standard choice for capacitors in the signal path. iFi making a point of this is akin to a car manufacturer boasting about using rubber tyres.
And then the star clocking, I wondered if that was to suggest alignment with the stars. I did think perhaps it was a real term I wasn't familiar with. I mean, when I looked it up I got a Sky and Telescope article explaining how to make a star clock for kids. 
