Before simply removing tags, it's best to let the discussion take its course first. We are probably working from different definitions of abstraction, hence the need for meta discussion and tag editing before removing tags.
I use the following from the AP CS Principles Course Description:
Big Idea 2: Abstraction
Abstraction reduces information and detail to facilitate focus on relevant topics. Everyone uses abstraction on a daily basis to
effectively manage complexity.
Both of the questions I asked with abstraction are appropriate for that tag given the standards defined by the College Board. Array indexing is an abstraction for pointer arithmetic; therefore, my two questions that focused on the topics of arrays, indexing, and pointers are appropriate for abstraction. Indeed, the central question in one of them was about whether or not to teach said abstraction.
Given the widespread presence of this course and the number of teachers thereof, I think AP CSP's definition of abstraction is at least one key part of how we define the abstraction tag here.