GSAK does "something" with JSON although it may be a custom handler.
You can get a list of queries that belong to the signed in geocacher.
https://geocaching.com.au/my/query/list.json
I think that's part of your macro so you must know how GSAK handles JSON parsing.
You can then get a GPX file based on the query you select (which is passed as a GPX file).
I also assume that GC don't provide a GPX file when you call their API (although I really don't know) for a list of geocaches, so there must be "something" that handles it.
Simpy put the function was technical debt (too much time and effort to update vs. the use of the function). It get's used "maybe" once a week and by very few people.
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