It’s a good question, and when we start getting into a lot of higher-rep bodyweight-type stuff it can become confusing when we think of how to classify things. If I were coaching you and putting this type of work into a training plan, I wouldn’t classify this as “Zone anything,” necessarily. I usually keep Zone classifications limited to aerobic/endurance/running/monostructural work. The example you gave would be something more akin to muscular endurance or work capacity depending on what type of verbiage you like to use. Your HR may very well be in a given zone by virtue of how many times it’s beating per minute, but trying to use that to then figure out how many minutes of XYZ you’re going to do in a week or a training phase just muddies the water.
Hopefully that makes sense…if not let me know and we can try to dive a bit deeper.