Sanidopoulos is a Greek Orthodox Christian, and so is referring to this liturgical tradition in the above quote.The actual title of the sermon could be something like, "Why A Cemetery Is Named Thus." This homily is traditionally read during the services for the Tuesday of St. Thomas because it was originally delivered on this day.
The a blog post goes on to cite some excerpts from the homily, translated into English (presumably by Sanidopoulos).
I received assistance from a Logos Library Specialist back in 2020 to find out if the work was available in Logos Bible Software, and she informed me that it is not (thanks again, Katy Smith!). She was able to find it translated into Russian in:
"Sermon on the Cemetery and the Cross," Works of our Holy Father John Chrysostom, Archbishop of Constantinople, in Russian Translation, Vol. II, Book I, p. 431. St. Petersburg: St. Petersburg theological Academy, 1896.
At that time, the book was available on eBay for purchase, but was cost-prohibitive for me and the link is now dead (and was not preserved on archive.org).I am looking for this sermon in Greek, but translated into any language is fine.
I also posted this request on the Christianity Stack Exchange website, in case you run across that post when searching.
Thank you!