Funner follow-up: this definition is correct and true to the original usage of “factoid”, however, the alternative definition meaning “a small or minor fact” has been used often enough that it’s generally accepted, and appears in several dictionaries. Ain’t English grand!?

Sources:

• https://en.m.wiktionary.org/wiki/factoid
• https://www.merriam-webster.com/dictionary/factoid
• https://www.oed.com/dictionary/factoid_n