Comment by neilk

You're right that it's become a stock phrase, is somewhat redundant, and I used it without thinking. I strive to avoid such stock phrases (see Orwell's Politics and the English Language), so I thank you for drawing my attention to that.

I don't think it's a dog whistle. A dog whistle is when you signal something to a subgroup of your audience, using language that only they will understand. I have not seen "lived experience" used as a dog whistle.

I have seen it used to contrast official or elite discourse with what happens in one's daily life. For example, official statistics may show that crime is down in your area, but that does not comport with how you are now avoiding certain areas of town completely. Or a woman might be told that their company does not penalize them for taking maternity leave, but in practice they see they are sidelined. The "lived experience" trope is usually deployed when you start trusting your own biography, even the reactions of your own body, as a source of knowledge, opposing dominant narratives.

According to my very some brief research, it seems to have entered English from German, in the writings of Simone de Beauvoir.