It referred mainly to the first. This variant is simply not safe. How are children supposed to learn to climb stairs with it, and until what age do they need to be supervised? Our children could do it at two years old, and that is truly a blessing because the parents no longer have to be there every step of the way, and the children can go to their rooms by themselves, etc.
Regarding the price, ask the GU again. It will be more, he forgot the designer glass child gates (I'm guessing 3T€).
But with both variants, you have to be aware that they will never be clean unless you have a cleaning help who comes every two days.