Deprecated is a word. No negativity implied, but equating "deprecated" to "depreciated" is insular. It is okay to be wrong, I have been wrong (George Foreman Grill dissenter..."it drips fat in the front? Gross."). I am not sure what your native language is, and I wish I did so we could communicate, but it is like calling a "warning" as "decay" in English (US).

Typo corrected.