I haven't seen the term "AJAX" used in years. Very bad sign both for the project and people mentioning it.
https://en.wikipedia.org/wiki/Ajax_(programming)#Technologie... XML (the X in AJAX) is not even necessary as JSON came in.
Any React/Vue/Angular/... client application using `fetch` to make a request, is making an AJAX request. Just because you haven't seen the term in a long time does not mean it is outdated.