oh goodness I feel very old all of a sudden

Browsing r/fountainpens today, as one does, I observed the following:

I have been writing out my Morning Prayer as part of my journal prompts and thought it would be fun to have a dedicated "Prayer Pen". Thinking something somewhat decorative/festive with a broad nib and a gold/bronze ink? Something unique, A way to quickly identify the posts when I look back on my journal. Thank you

I am pretty sure I have never before seen "post" used to refer to a physical entry in a physical journal. I am fascinated to know if this is idiosyncratic individual usage or a more general linguistic shift in process.