"Addend" as a verb: Eggcorn?

[Marc Sacks]

In the MyDD blog this morning, I found this sentence:

"As you might know from reading my posts in the past, I don't usually
addend my own thoughts to my interviews."

"Addend" looks like a cross between "add" and "append" and possibly a
back-formation from "addendum." Has anyone in this group encountered it?

Marc Sacks
msacks at theworld.com

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