He might be referring to the common issue reported on cold weather flying on these threads: Many mention their P3 was fine but their IOS devices often shutdown during a flight, even with full batteries. This isn't mentioned very often for Samsung devices.
There is one study that backs this up. PCWorld did some testing of various phones at progressively colder temperatures to see how they handled it. Iphones were some of the first to shut down when it got cold. The study is a bit dated now; testing the Iphone 4s for example. I'd love to see a new study with the latest models from the different manfucaturers. But I'm sure a lot of the tech hasn't changed since the study was done:
Sub-Zero Weather: Can Your Smartphone Stand The Cold?