Yes, the Sony A99 variant they used has a semi-transparent mirror: it uses ONE lens. It uses expensive, large, SLR-sysetm lenses. We can be pedantic, and try to disown it as an SLR, but...it is an SLR camera. Nikon and Canon had pellicle mirror SLR cameras decades ago. The fixed, non-flapping, semi-transparent mirror design SLR type has been around for decades now: Sony just put it into mass production, at an affordable price.
Anyway....looked through that. In MULTIPLE instances, the iPhone 7 actually made a better picture than the larger-format A99 dids. Deeper depth of field is very often a huge adavantage in reportage/documentary type, one-frame shooting.
Several shots, like the control panel shot: The SLR camera had a few inches worth of readable information,and then a buttload of out of focus mush; the small-senor camera offered incredibly deep depth of field, and made a much better picture. Anybody who is a serious shooter will recognize that achieving the type of deep,deep depth of field that a smart phone camera can get is something that can/may/does offer incredible utility in a lot of shooting situations, for a lot of people. Forty years of the f/64 Group idolized deep DOF images.
AND--this is something many people forget: with the newest phones, with FAST lenses, like f/2.8 on iPhone 4, and even-faster on newer models: due to sensor size, the phone cam can achieve deep DOF even at WIDE f/stops, like f/2.8, and FAST shutter speeds, at ISO 80 to 100. This is physically impossible to do with a larger sensor, at the same picture angle.
In some cases, the iPhone 7 made a much better picture than the Sony A99 did. With a professional photographer doing the shooting, a number of the comparison images were really quite illustrative of how FAR the iPhone 7 has brough phone camera photography.
If the idea that "a much better picture" means a sharp foreground subject, and then a huge expanse of background that has no detail and no real information in it, then yeah, the large-sensor d-slr is the tool for the job.