Eh, that just comes down to the arbitrary definition of how much of a discount you consider "losing the peg".
Sidestepping the definitional issue, I certainly worry when a pegged asset trades at a persistent discount, even a small one, when it didn't before. A stablecoin should generally trade at a premium just as often as it trades at a discount. When one goes long periods without ever being above, that is a strong signal. And when everyone panics, that's exactly when it's too late to get out. You have to beat the rush.
Remember, even up until the morning of May 9th, the day of the real TerraUSD depeg, people made that exact objection. "Oh come, on being 0.1% off is normal for stablecoin." Indeed it is -- but not in a persistent fashion!
Disclaimer: I closed out my Tether longs last week.