> just Googled the definition; it reads the same as the posted definition on various sites; from Merriams to Oxford

These are those source’s definitions [1][2]. They’re significantly more precise than the one I suspect you got from Google’s AI, hence your mis-use of the word. (Mis-use is fine. Doubling down against evidence is less forgiving.)

[1] https://www.merriam-webster.com/dictionary/propaganda

[2] https://www.oed.com/dictionary/propaganda_n