When I read the translation, I initially thought that it referred to the anicca nature. Essentially, the contemplation of anicca as “[every pleasurable experience] that has a beginning also has an end,” which is technically correct.
But when I saw the Pali terms “samudayadhammaṁ” and “nirodhadhammanti,” I assumed that it was probably referring to exactly what you explained.
I think this is a good place to thank you for everything I’ve learned on your website!