I agree about this description of it. I find that it's actually more emotive and expressive than previous Sonnets but mostly as a consequence of being more coherent and agentic - "alive" seeming.

Regarding the being test thing, it just often expresses that it thinks it's being tested, and starts seeming paranoid and anxious when its e.g. asked weird things that don't obviously follow from the context, and thinks it's a test, and also talks a lot on the meta level about having to do perfectly at tests, etc