While it is likely true that the 'reviewing' of LLM-generated output involves less critical analysis than doing the work oneself (for reasons that have been well-understood since before LLMs existed) - I don't actually think that a study based on self-reports with no external assessment is a credible source to back that up.
"How does one perceive their critical thinking" is just as prone to cognitive biases as the 'uncritical review' problem itself is.