The article mentions "an example of 彁 mistakenly used in a digitized Taisho newspaper due to a faded printing of 彊", but to me that implies the symbol already existed before then.
Indeed, the source link is about exactly this: a crappy scan appears to have 彁 but a better copy reveals it was 彊.
[0] https://emojipedia.org/pregnant-man
[1] https://www.reddit.com/r/technology/comments/u7x3l9/comment/...