One possible interpretation is that someone simply decided the presentation should keep things simple and avoid confusing people by mentioning more than one bra

One possible interpretation is that someone simply decided the presentation should keep things simple and avoid confusing people by mentioning more than one brand. This is a pretty common strategy in communication: pick one main idea you want to get across, and stick to that only. If you throw in everything that you can think of but the kitchen sink, the distraction does more harm than good. Following that reasoning, Pixel is the brand of those specific phones, so that is the brand you mention on that occasion.