"This article oddly includes "depreciation", but (anecdotally) I've never heard of this being confused with "deprecation"."

Then you may be in for an instance of the Baader-Meinhof Phenomenon [1] now. It's very widespread. Sometimes it feels like I see "depreciation" more than "deprecation". I've even heard people say out loud "depreciation" several times.

[1]: https://science.howstuffworks.com/life/inside-the-mind/human...