That post misrepresents its own source.
"It’s worth noting that a 2018 poll of individuals who have chosen not have children found the most frequently-cited reason for their decision was a desire for more leisure time."
... "more leisure time" is a link to a NY Times article[1]. The chart in that article shows economic reasons[2] collectively cited much more frequently than a desire for more leisure time.
1. https://www.nytimes.com/2018/07/05/upshot/americans-are-havi...
2. "Child care is too expensive", "worried about the economy", "can't afford more children", and "waited because of financial instability" all score more highly than "want more leisure time". These are all economic[3] reasons. "Want more time for the children I have" could be seen as economic also, given that the most likely reason for not spending as much time as desired is having to have employment.
The list goes on: "not enough paid family leave" and "no paid family leave" are the next highest-scoring reasons. Also economic reasons.
To me this chart cumulatively reads as "I/we are forced to spend more time than I/we desire in pursuit of income/financial security, with unsatisfactory results." It confirms that "economic reasons"[3] is the primary cause of low fertility.
3. "Economic" comes from oikos and noum-, "household" and "budgeting/regulation", so all of the reasons above are economic reasons.